Bake82 Posted June 11, 2003 Report Share Posted June 11, 2003 I finally got a dual exhaust set up, and I love the look, and sound(not too loud, but enough to know it's there) but when I had it in there, the guy said it would sound better and run better if I put a high flow cat on. I figured it definetly would aswell, but I am wondering how much better will the performance be. The shop said it would be $250 cdn installed. I think that is a LITTLE pricey, but not sure. Is it worth it to dish out the cash for the performance I would get aswell as more agressive sound from it? Opinions would be greatly appreciated, as I don't want to dish out the coin and then it be not quicker than I thought it would be... BTW...2.8 V6 if that matters...thanks Quote Link to comment Share on other sites More sharing options...
NOHC_WBody Posted June 11, 2003 Report Share Posted June 11, 2003 Any mods you do that help air into/out of a motor are going to increase performance. Just don't expect monumental ones with just an exhaust. At the most, I'd say a tenth at the dragstrip. Your biggest increase would probably be gas mileage. BTW, what kind of "hi-flow cat" is it anyway? Brand? Model #'s? Unless your cat is severely clogged, it's not a signifigant source of restriction. If you're going to upsize the pipe(say to a 2.5) and keep your stocker, all they're gonna do is weld on an adapter to your cat. If you go with an upgraded one, and still have a stock style dual exhaust, they'll still have to neck it down to the stock diameter of the pipe it feeds into. Cliff Notes: High Flo Cat. Not worth it, IMO. Quote Link to comment Share on other sites More sharing options...
Slade901 Posted June 12, 2003 Report Share Posted June 12, 2003 If you are short on cash then wait.. A better cat is no cat at all.... With me.. When I'm ready to replace my cat. I'll replace it myself. I don't have a torch but I use hacksaw (I've done that before) or air cutter tool or pipe cutter. I'll just use a coupling and clamps (available at autoparts store). One of the reason, I've joined this forum was to gain knowledge from our members experts/experience with their cars and help others what I have learned. The only way I'll learn is by doing it myself. Quote Link to comment Share on other sites More sharing options...
Bake82 Posted June 12, 2003 Author Report Share Posted June 12, 2003 I don't know what kind of high flow cat, didn't really get into a good discussion about it, but I figure it's a walker cat, considering thats the kind of mufflers I got. Yah thinking about it now, if I was to do a high flo cat, I'd probably just instal it myself. Can't be too hard to cut pipes and then use clamps to hold them on! good point! Yah I'm not straped for cash, I don't need a new one, just I was wondering if I'd see a big gain in performace. And if I would see a big gain then I'd do it. But the muffler shop guy said, that "I would be able to smoke my tires off my car" with the high flo cat. Some how I don't see that being true. Oh well, any more opinions on the high flo cat situation! Thanks for your help Quote Link to comment Share on other sites More sharing options...
Guest TurboSedan Posted June 12, 2003 Report Share Posted June 12, 2003 A better cat is no cat at all.... i agree but i don't like the idea of polluting. i'm still planning on running a 'test pipe' in my CS after i turbocharge it, mosty because Wyoming has NO emmision checks. i plan on deleting EGR and i already removed my A.I.R pump as well. i'm probably going to go with a 2.5" exhaust after the dowpipe, then just put a muffler where the cat was and straight pipes out the back (w/fake factory style dual tips). i might get a Walker or Catco later, i dunno. btw, i wouldn't clamp in a muffler or a cat. get it welded. just my opinion. joshua Quote Link to comment Share on other sites More sharing options...
Baddflash Posted June 13, 2003 Report Share Posted June 13, 2003 I just had my exhaust done. I had a free-flow muffler welded in place of cat and straight 2.5" duals. Sounds great but a bit loud I plan to get a pair of mufflers for back as soon as i can find some that'll fit. I wouldn't spend the money on a free-flow cat and i wouldn't expect to notice much of a difference if you did. I did mine like that as I hope to soon drop in L67. Quote Link to comment Share on other sites More sharing options...
Lee Posted June 13, 2003 Report Share Posted June 13, 2003 I'd think that a freer flowing cat would lower the back pressure and reduce low end torque. For an automatic that should make it harder to smoke the tires. I have no cat. I have a flow tech glasspack in place of it and dual dynomax super turbos. I can squalk the tires a bit but I ain't never made smoke since the 400CID Ranchero with 4 barrel and headers. Quote Link to comment Share on other sites More sharing options...
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