Hi,

This is David Borla from Borla Exhaust. We're getting ready to begin the research and development stage of designing a high performance, T-304 Cat-Back and Header for the Evolution.

In order to offer aftermarket parts that will specifically excite EVO owners, I'd like to get some feedback from you guys regarding the following;

1) Horsepower gains - What are your expectations from a T-304 cat-back and header?

2) Style - What are your preferences regarding looks for the cat-back? Single tip? Dual tips? Tip style?

3) Sound - How much louder than stock?

4) Coating vs. Polishing - Regarding the header (keeping in mind it's T-304), which do you prefer?

5) Competition - What exhausts and headers are currently available for the EVO? What are their features and benefits? What grade of steel are they made of? What is their retail price?


I'd like to build a header and cat-back that will cater to the unique needs of EVO owners. Any assistance you can offer will be greatly appriciated.

We are also looking for a test vehicle to develop our products. If you live in southern California and are interested in loaning your EVO in exchange for a header and cat-back, please email me at davidb@borla.com. We will treat your vehicle with the utmost care and respect.

Thanks!

 

well first off i would say it has to be a single tip so that it can come out the factory spot in the bumper with out haveing to cut it away. it also shoudl come farther out then the factory so there is less problems with people bumpers turning black

 

Well, i would say 3" mandrel bent exhaust.. With 2 mid pipe sections one with a high flow cat and one with a straight pipe.

Single tip, probably 3-4" straight through muffler..


Also it might be nice to have a resonated mid-pipe.

The most important thing to me would be 304 SS and also have the muffler and any presilencers packed with ss wool..

For the turbo manifold, i would not worry about, if you do make one, make one for a GT style turbo for upgrades, the stock EVO manifold is pretty decent for a TDO5 based turbo.


-Zach

 

What they said and an exhaust silencer is a must for me, so that I can have power when I want it and silence the exhaust when I want to.

I like exhausts that are loud enough to sound aggressive, not not obnoxiously loud, but I would never want power sacrificed to quite the exhaust down.

 

Well in that case, you would want a funnel comming off the turbo.. getting larger and larger


It would be loud as hell..


But yeah, make it loud and sell it with a muffler silencer..


-Zach

 

David reading this post is a dream come true to have you ask these questions. I would say single tip exhaust much louder then stock. Stock is way to quite due to having 3 cats. As far as hp gains I would say a good exhaust upgrade should add at least 10 hp to wheels alone not including the header. Polished looks so nice by the way. Lightweight exhaust is a must of course at least lighter then stock. Seeing the material type it will not be a problem I'm sure. I've been seeing exhaust for as much as 1300.00 which is way way high, but it is titanium metal.

 

Most cat back systems get 8-10HP at the wheels, when you end up designing it id imagine your going to go for a 2.5" OD pipe for a fine line between performance, backpressure rating, flow, and noise level.

Ugh nothing ricey please, dont do a double wall 4" tip there very ugly. Polished SS single tipped 3" with a angle cut off's looks sharp, anything larger and it will be gross.

50 State legal noiselevels

You should offer polished as standard, powdercoated ceramic should be offered as an option


See if you could knock off a few pounds from the stock catback, like using a thin wall pipe or a smaller muffler w/o as many internal bafflings if placed in specific spots you could route exhast gasses much better w/o the extra noise (such as flowmasters mufflers). Are they any plans of making Borla Downpipes?

 

I do not know if many people will agree with me on this topic BUT.. since the car is pretty heavy compared to most cars.. If this was the lightest exaust system out there..with around the range of hp gains such as JIC catback, and RMR's... I will gladly pay 50-150 dollors more for weight savings... Just something to keep in mind..

IDK how other people are about weight savings for this car..so just an oppion from me...

 

Make it substantially lighter than the stock system. We see our cars as being too heavy already. So if you could make a system that is 20-25 lbs lighter than the stock set-up, and make it lighter or cheaper than the other aftermarket brands, people may buy your exhaust for that reason only.

A single tip that is polished and cut at an angle. But don't make that tip any larger than the stock tip....unless your research shows a hp gain with a larger tip.

Headers....Is it possible to make your headers fit under the stock heat shields and still be optimal in design regarding hp gains? If it could hide under the stock shield, it could more easily sneak under the radar at the state inspection station in many states.

SC~

 

Hello David ... first thing first ... I wanted to tell you that I have used some of your products in the past, and I have been most pleased with them. Well ... I'm not going to go into detail here ... because there are many ideas here already, but whatever you do .... please strive for lighter weight (compared to stock) and performance-performance-performance! And whatever it takes to achieve it ... even if the system is a couple $ more to design & build. As far as decibal level ... I'm not too concerned with it as long as it sounds healthy ... and not like a Civic with a Monza tip.

 

Hello David,
Light-weight, polished, a muffler design close or exactly the same as the factory muffler, a reasonably quiet exhaust (Borla's usually have a unique low tone sound, I like it), 10+whp, include a 3" downpipe, I would like a 3" cat back (The factory pipe is just under 2.5 according to some of the posts here). I must tell you that out of all the exhaust venders, I've been waiting for Borla to build one. I believe the 3" downpipe has very little clearence, 1/4" on either side of the pipe once it's installed. Is it possible to form it into an oval at some point for better clearence? Good luck and I will be your first customer!

 

What are you talking about? The stock exhaust has a 4" tip with angle cut to look like a 3" You think the stock exhaust tip looks bad

 

David,

Thanks for taking the time to inquire before design and development begins. I have used your products in the past and have been very satisfied. Looking forward to your offering for the EVO.

1. HP: Gains of 8-10 at the wheels have been achieved with cat-back systems offered by exisiting vendors on this forum. I would expect similar performance gains from your cat-back. Add a 3" free flow catalytic converter and a mandrel bent 3" down pipe with an oval section to provide at least 1/2" frame cross brace clearance to prevent future rattles. Based on measured improvements from partial system replacement documented by other vendors, the installation of a full "turbo-back" system, should yield 15-20 HP measured at the wheels.

2. Style: Stock appearance which is single 4" slant cut polished tip.

3. Sound: Stock like quiet for normal cruising (3-3.5k rpms). More performance like low pitch tone for aggressive accelleration and WOT.

4. Coating vs. polishing (for header): Initially ignore header as stock manifold is sufficiently designed for high velocity needed for the twin scroll turbo and performance increases most owners are after. A competition header may prove some value but at that point owners will probably not opt to retain the stock turbo.

Complete T-304 Stainless system w/polished tip would be an acceptable material choice for most. Some will opt for more expensive Titanium for additional weight savings.


5. Competition: At the current time the competition has been limited to the first available system in contrast to the best performaing system. Currently, choices are somewhat limited. However, a handful of systems have been designed and are currently or near ready to ship from most vendors on this forum. Prices range from $500 - $1300 depending of material, and which pieces are being replaced. A fair price for a full turbo-back 3" system is probably in the ballpark of $1000.00 for T-304 and more for Ti. Follow the link for details: https://www.evolutionm.net/forums/fo...?s=&forumid=73

To be considered as a viable option by many forum members, it would be in Borla's best interest for you or someone at the company to actively update this forum with your design and development progress. Unfortunately, out of sight often means out of mind.

Good luck.

 

Hello guys,

This is David Buschur from Buschur Racing, Inc.

I like what you guys are saying about the catbacks you want!! The reason why is we already have ours done. As a matter of fact as of this morning we have shipped out 11 complete 3" systems.

The stock catback on the car weighs in at 36.5 pounds. Our catback weighs in at 16.5 pounds, as you can see this is a 20 pound savings in just the catback. The entire system on the EVO8 weighs in at 60 pounds even. Our complete 3" system weighs in at only 24.6 pounds, a 36 pound savings over stock. Our system is complete 304 stainless steel from front to rear. It uses a single 4" polished stainless steel tip and muffler we had designed specifically for this car. The road noise from the factory tires on the EVO8 is pretty loud as you all know. It is loud enough to actually cover the exhaust noise at 60 mph. At wide open throttle though.... LOOK OUT!! This system ROARS! I also made the system so the tip sticks out just passed the rear bumper cover. The stock tip turns the cover black from the car running so rich. This gets it out just far enough that you can see it and there is no discoloration.

We have these systems in just catback configuration where only catback changes are legal, such as SCCA racing.

The full 3" system with downpipe, offroad pipe and catback is only $750. The catback that is used for the legality issues is $525.

BTW, the car ran a 12.94 at 109.33 mph. It weighed in at 3370 pounds with me in it (205 lbs) and 5/8 of a tank of fuel. This was on Norwalks digital scale.

The car has our full 3" system on it, AFC, our aircleaner kit and our cockpit adjustable manual boost controller set at 19 psi. This was on 94 octane from Sunoco.

Thanks for reading,
David Buschur
President
Buschur Racing, Inc.

 

hi
im interested in tubular ss headers and downpipe

and whatever you do dont make the exhast too "ricey"