...more "exhausting" questions.

[Meanmyz]

My car is currently at Marc's getting his 350/510 package.

After doing much thinking on the subject of exhaust, during the time frame of our first SW group buy, I decided on:

- SW headers (factory connection) with cats.

- Corsa exhaust


One thing I have learned since then, and please correct me if I am wrong, is that:

- Having headers with the factory connection point means that they NO LONGER are considered "long tube headers" as talked about on Marc's site for power upgrades.

Is this true?


Also, in reading some comments in another exhaust thread about headers without cats being VERY loud..."annoying and attracting unwanted loud attention", I am now wondering...

1. Will my SW headers with factory connection points, attached to high flow cats and Corsa exhaust, be "annoying and attracting unwanted loud attention"?

2. For the fact that my headers have factory connection points, (which makes them "shorty headers"?) will they have an adverse effect on torque band and horsepower?

(I understand that cats will slightly drop HP but might help with less tinny sound)

For "those in the know", I appreciate your input. Thanks!

[We Gone]

I can only comment on adding cats, I also have Marc's 510 package. I have SW long tube headers. I went from Flomasters with high flow cats to Corsa without cats.
It sounded great at WOT but I did not like the hollow tinny sound at low RPM's. Before I went back the Flowmasters I added the high flow cats back to it. Sounds much better lost most of the tinny sound and has a deeper sound.

[edram454]

get rid of the cats if you can. power robbers. get a resonator to get rid of the drone. try to use the long tube headers as "long tube" headers should be used, dont cut them. by cutting them you will lose some of the benefits of scavenging heat and the cats just suck up power. On my c5, the cats insides were blown out the exhaust pipes during dyno tuning. As soon as the guts blew out I picked up 25 horse.

ed ramos #3028.

[Schrade]

You adding the pipes there Meany? Or is Marc?

If you're doing it, post snappics if you would... I'm gonna' add OBX's pretty soon here.

Anybody else got shots of pipe-work install? Tips?

(not tryin' to boost your thread here Meany)

[mike100]

SW does sell adapters to hook up to stock cat-back/ factory connections that you can use on long tubes (not running cats). shown in link below- theoretically no welding -maybe on the passenger side, but I can attest that the ball flange on the driver's side works like a champ mating to the stock pipe set or on a Corsa.

http://www.stainlessworks.net/catalo...16/image/1294/


You can run cats on long tube headers if you really want to bad enough:
more recycled Z06 parts- LS7 catalysts using what was left of my SW adapter tubes (slip on collector fit).

[Bob Eyres]

Originally Posted by Meanmyz

I understand that cats will slightly drop HP but might help with less tinny sound

If you are environmentally sensitive, or live where there are strict emissions laws, cats are a good option. But I would not choose them to affect sound quality. An X pipe does more to smooth out sound, and improves performance.

My car (below) has a "no compromise" system. It's quite loud, and resonant in the 18-2,300 rpm range, but note the trap speed in the quarter mile, and indication it is putting out very good hp. (for an otherwise stock engine).

Marc is the best judge on how the length of your header tubes will affect performance. He's building it for you, pick his brain.

[WARP TEN]

My experience with five or six different systems over 2 Zs and 20 years is that having cats softens the sound. They also cost several horsepower, from about 5 to 10 hp depending on high flow vs stock type ceramics. Marc can provide the power info, and he also has noted improvement in sound with them. After a total of about 15 years with Corsas (and cats), which I liked the best, I have now gone back to a stock system with no cats and cutouts. --Bob

[Kevin]

friend of mine had a headers/no cats/corsa car and it was great to drive, quite inside, loud but not obnoxious outside and sounded good...if you like the sound of corsa

[bradley]

my 90 runs with a 21/2 in dr gas set up x pipe and spin tec mufflers ,car has jeal headers corey henderson tune and plenum and injector housing porting .its run 12.10@119.47 mph in 90 degree weather @ famoso in mac farland ca. . this run is on you tube. if any one wants to hear how it sounds .

[Meanmyz]

Thanks for all of your responses guys. I appreciate your input.

For sure, with cats, as it has been written many times (and on Marc's site) with cats, expect to lose around 8 HP. I'll just expect at worst 10 and hopefully it will be less.

My biggest "enlightment" since buying headers, is that MY headers are not considered "long tube headers" for the fact that the tubes have been cut, a foot or so, short for the cats.

This sounds "common sense" but for my un-enlightened case, I assumed that headers, (as produced for the ZR-1), are "long tube headers" (I have seen other headers for other vehicles that definitely for most obvious reasons, can be nothing OTHER than "shorty" headers.

The newly learned point for me being: for "long tube headers" the length of the primary at the back end is of some importance to HP or torque variation, before the collector. Right?

My other question was whether in your opinion, you found my exhaust combination "too loud". I know this is subjective, but I have appreciated your inputs.