arod6692 Posted November 22, 2012 Report Share Posted November 22, 2012 (edited) alrite guys ive read a million threads on this. But i still have a few questions and correct me if any of this is no good. but i think im gonna run 2.5 exhaust with a l/t header which is better from what ive gathered and a magnaflow x pipe to some flowmaster mufflers. Also what size header 1 3/4 1 1/2 or what?I currently have 40series coming out in front of rear tire with siverline tips. Now has anybody ran the race 10 series flowmaster mufflers on these trucks. I have them on my gnx and they sound wicked. But i still have to pass emissions as well and thats my other questions if i remove the cats and tune will it pass I live in IL buy the way and also would i get better power and sound from removeing the cats or putting on hi flow cats. If you have anything to add please do so and thanks for the help. Edited November 22, 2012 by arod6692 (see edit history) Quote Link to comment Share on other sites More sharing options...
Silverad0 SS Posted November 23, 2012 Report Share Posted November 23, 2012 (edited) 3"in 3" out mufflers and 1 3/4 LT's. no you will not pass an emission test with no cats. Edited November 23, 2012 by Silverad0 SS (see edit history) Quote Link to comment Share on other sites More sharing options...
GI.SS Posted November 23, 2012 Report Share Posted November 23, 2012 It depends how your state does their inspections... In nj which used to be very strict, they now currently do a visual and look for something that looks like a kitty cat and hook up to the obd2 plug to see if any codes are being thrown or out of order. Do your research ... Quote Link to comment Share on other sites More sharing options...
Silverad0 SS Posted November 23, 2012 Report Share Posted November 23, 2012 in texas its just a sticker!! Quote Link to comment Share on other sites More sharing options...
arod6692 Posted November 24, 2012 Author Report Share Posted November 24, 2012 (edited) yeah ill have to look into it. I might as well just get the high flow cats just in case. I mean its my daily driver so its defiantly got to pass inspection. and 3 in exhaust wouldn't be to big. I gonna be doing quit a few bolts on and a tune but nothing internally yet.So its gonna be 13/4 lt with high flow cats x pipe and 10 series race mufflers with tips in front of rear wheel. Anybody running this set up and have pictures so i can see how everything looks. Also i just checked the emissions testing info its just a obd scanner test. Edited November 24, 2012 by arod6692 (see edit history) Quote Link to comment Share on other sites More sharing options...
GTRogers Posted November 25, 2012 Report Share Posted November 25, 2012 You can get a tune to where your computer thinks you have CATS and it really doesnt. Its alla bout knowing the right people, in TX I just paid someone to get a sticker I never even had to bring my truck there, just paid like 120$ and gave him my vin and he gave me a sticker. Quote Link to comment Share on other sites More sharing options...
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