Hey, it's me again I have to go with what you said about high flow cats but I have another question.Do the high flow catylic converters make that much more of a difference in low end torque?I was thinking of buying a pair because my 05' 4.8 silverado reqires 2.That and the headers should give me a lot more gain than just headers and stock converters don't you think?Really I'm just looking for more low end torque than top end I already have top end pretty good.AS&M makes a good set of headers I heard,and what is the best set of high flow cats I can get?Can high flow cats still pass emissions?Sorry about all the questions I just want to haul ass, and be legal. Thanks,Axelbeast
Yes they do make a big difference, BUT you must take into consideration the O2 sensor on the output side of the converter. If it doesn't see the flow being hot enough to satisfy the computer, then you may have a check engine light come on. There is an aftermarket O2 sensor on the market that tricks the computer into thinking it is hotter than it really is. It does this because it is a heated sensor and really does get hot enough to do the job. With this in mind, one could open the converter on the top side, remove the insides, weld it back, and who would know? If you have ever looked through a converter, they are so clogged with stuff that not even light can go through it. If you go with headers, a larger diameter pipe all the way out, and a muffler that really flows, you can expect to see huge gains in power, gas mileage, and tire frying power.
Glad to help you, Good Luck!!!
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