***The Next Generation Rasp Terminator (aka the RT2)***

[Custom Performance]

The original RT was a huge success. Thanks to all that purchased one and provided comments here in the M3Forum or to us personally. We apologize for the brief period that we were out of inventory – but now, the wait is over. And, after seeing, installing, and hearing the Next Generation RT, the wait was well worth it.



The RT is now all 304 polished stainless steel. The resonator is a dual core, straight through design (like the original RT). The flanges are now TIG welded using stainless steel wire.

This end connects to section 2


This end connects to the header collector


Each Next Generation RT comes with everything you need for installation – new gaskets, bolts, nuts, washers, and DIY instructions – All for only $429.00 (shipping is also included).

FAQ

Q - What makes the Next Generation RT different than the original Rasp Terminator?
A – A couple of things. The original RT used 400 stainless for the pipes and 304 polished stainless steel for the resonator. The Next Generation RT is all 304 polished stainless steel. Also, the original RT used a loose flange with a flared pipe to connect to the header collector. The Next Generation RT uses fixed flanges that are welded to the pipe – provides for a better seal.

Q – Is a single resonator better than 2 bullet style resonators?
A – Both eliminate the rasp and both use a straight through design. It’s a matter of preference and cost.

Q – How is the Next Generation RT different than using 2 ARs?
A – When we came up with the idea of using the ARs almost 2 years ago, our goal was to kill the rasp. Installing 2 ARs did the trick; however, you cannot return to the stock section 1. The stock section 1 has to be modified – a small section has to be cut out and the ARs have to be welded into place. The Next Generation RT is a direct replacement for the stock section 1.

Set of AR20s installed.


Stock Section 1.


See the original Rasp-B-Gone thread here -> Original Rasp-B-Gone Thread

Q – How is the Next Generation RT different than Stebro?
A – The Next Generation RT, like the original RT, uses a dual-core, straight through resonator that allows for a free-flowing exhaust. The exhaust flow in a Stebro, as seen in the picture below, is restricted and therefore, creates a hot spot.



Q – How is the Next Generation RT different than the Borla midpipe?
A – The biggest difference is that the Borla midpipe includes both a section 1 and section 2 (i.e., from the header to the muffler). The Next Generation RT replaces section 1 only since this is the optimal way to eliminate the rasp. The Borla midpipe also uses a straight through style resonator but can only be used with the Borla midpipe section 2. The Next Generation RT can be used with the stock section 2 or any aftermarket section 2 that uses a original equipment fixed flange like the Supersprint X-pipe or the Eisenmann section 2.

Q – Is there a Warranty?
A – Yes – life time. The warranty is transferable. Should the Next Generation RT (or the orginal RT for that matter) fail for any reason when used at designed (to kill the rasp when using OE headers), it is replaced at no cost to the owner.

Q – How much does it the Next Generation RT weigh?
A – Total weight is 17 lbs.

Go here if you are ready to reserve a Next Generation RT -> BUY NOW

[Viper966]

cool, nice price, but i <3 my rasp with a borla muffler

[bCaHnIaCnKa]

hmm . . . will this reduce the loudness of the exhaust or cause drone?

[Custom Performance]

Originally Posted by bCaHnIaCnKa

hmm . . . will this reduce the loudness of the exhaust or cause drone?

It will deepen the tone of even the stock muffler and will help to minimize droning to some degree on aftermarket muffles. Drone is typically caused by the muffler. A resonated section 2 will also help to reduce droning. For example, I had the RT, stock section 2, and a Borla muffler - almost no drone. Replaced the stock section 2 with a Supersprint X-pipe (non-resonated) and the drone went up a few clicks. I'm now testing our cross-over resonated section 2 (aka the X-Stream) and the drone has dropped some - but not down to the stock section 2 level.

[Andy W]

looks nice but i'm curious, and since this is version 2 i guess i was kinda hoping for something a little more different from version 1...I would've liked to see a crossover (X) in the empty section closest to the headers (oposite the resonator), as for the purposes of scavenging, this is the area that the X needs to be to be effective and efficient, closest to the heat source, not farther downstream. This is the reason why the Borla midpipe picks up a bit of power because they put the X in that location. I'm curious as to why a crossover wasn't introduced on this new version.

[Custom Performance]

Originally Posted by Andy W

looks nice but i'm curious, and since this is version 2 i guess i was kinda hoping for something a little more different from version 1...I would've liked to see a crossover (X) in the empty section closest to the headers (oposite the resonator), as for the purposes of scavenging, this is the area that the X needs to be to be effective and efficient, closest to the heat source, not farther downstream. This is the reason why the Borla midpipe picks up a bit of power because they put the X in that location. I'm curious as to why a crossover wasn't introduced on this new version.

The purpose of an X-pipe is to equalize (or balance) exhaust pressure on a dual exhaust system. An X-pipe does not really contribute to exhaust scavenging. The more efficient an exhaust pulse can exit the combustion chamber, through the exhaust port, and down the header tube, the better the exhaust scavenging effect. This is why headers are better then a cast manifold – and why long tube headers are better (i.e., produce more power) than short tube headers. The longer the header tube, the more time the leading exhaust pulse has to “pull” the trailing exhaust pulse down the tube (scavenging the combustion chamber). Once the exhaust pulses hit the collector at the end of the header, the scavenging effect is all but over. Also, with the catalytic converters integrated with the header, there is very little, if any, scavenging after the catalytic converters. So, the X-pipe in the Borla midpipe does not contribute to the exhaust scavenging. It does contribute to equalizing the exhaust pressure. Borla chose to but the X-pipe is section 1 rather than section 2 (like Magnaflow). An interesting match-up would be a Borla cat-back system vs a Magnaflow cat-back system since the X-pipe on these two systems are at opposite ends of the exhaust system.

The Bola midpipe is a great piece. I have one on my 325I and my 02 M3 (I have a Racing Dynamics now - testing purposes). I also have one on my 04 M3 (with an RT2 of course). I believe it produces more power that the stock system because of the mandrel bent tubes and the free flowing section 2. If you look across the performance exhaust landscape, for both foreign and domestic cars (Borla, Magnaflow, Supersprint, Bassani, FlowTech, BBK, TrickFlow, Corsa, etc., and custom systems) none put the X-pipe directly behind the headers. For all the Borla systems, the E46 M3 is this only one with the X-pipe directly behind the headers. For all other E46 M3 exhaust systems, the X-pipe (or H-pipe) is located in section 2. The overall effect – to balance the exhaust pressure – is the same.

It is important to have an X-pipe is an exhaust system – it has been proven over and over again to increase performance. We chose not to put an X-pipe in the RT2 so that it is more compatible and interchangeable with other aftermarket section 2 exhausts that incorporate an X-pipe or the stock section 2 – which uses an H-pipe – or the section 2 we are working on now.

[bmwm3smg2]

Hi Jack. Does RT2 still uses the same resonator from the first RT? I remember that the original rasp terminator uses Magnaflow resonator with Trux crossover internal piping. Is this still in the RT2. That was one of the features that I truly like in the first RT.

[ninekrpm]

Any sound clips with an aftermarket exaust?

[bmwm3smg2]

Anyone who has the first gen RT peeked through the resonator? Is there a true crossover inside?

[Custom Performance]

Originally Posted by bmwm3smg2

Hi Jack. Does RT2 still uses the same resonator from the first RT? I remember that the original rasp terminator uses Magnaflow resonator with Trux crossover internal piping. Is this still in the RT2. That was one of the features that I truly like in the first RT.

The short answer is no…however;

The RT2 uses a resonator built to our strict specifications. The resonator and pipes are 16-gage, 304 polished stainless steel. The tubing is all mandrel bent which allows the pipes to have the same diameter as the straight-through sections of the resonator. Inside the resonator is a perforated stainless steel, straight through, one-piece, dual core - wrapped with stainless steel mesh and high temperature acoustical ceramic sound absorbent material. There is no exhaust flow restriction with this resonator.

We wanted to move away from a stamped interal pipe and move the exhaust equalizing effect to section 2. The theory is… No exhaust restriction in section 1 and equalize exhaust pressure in section 2. To test this theory, we installed the RT2 and our section 2 (still under development) on a stock M3. The results were 286hp to the rear wheels. The stock M3 put down 275hp. In comparison, the Magnaflow cat-back system uses a similar setup – a straight-through resonator in section 1 and an X-pipe (exhaust pressure equalizer) in section 2. Unfortunately, the Magnaflow section 1 can only be used with the Magnaflow section 2, that can only be used with the Magnaflow muffler.

So, we wanted the best of both worlds. A system that is proven to increase power and totally eliminate the rasp, while at the same time, is interchangeable with other exhaust system components. There are no slip joints or band clamps. You can install the RT2 with any section 2 that uses the OE flanges. You will also be able to install the X-Stream section 2 with any section 1 or muffler that uses the OE flanges.

As for sound, the RT2 sounds the same as the original RT. It totally eliminates the rasp and make a stock exhaust sound very nice (if only the stock tips looked half-way decent). The RT2 pictured in the opening post is on my 04 M3 now – with a stock section 2 and Borla muffler. The sound is awesome! The sound clips on our website with the original RT sound the same as with the RT2. Here’s a link to the sound clips (scroll to the bottom of the page).

Rasp Terminator Sound Clips

We are releasing the RT2 now while we finish X-Stream section 2. The RT2 and X-Stream section 2 can be purchased together (when section 2 is ready) or separately depending on a customer’s current setup.