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Re: engine code p0420 and p0430
LT's are longtube headers. If you look at the factory exhaust manifold, it has a cat welded to it. Right after the cat, it is flanged to a short section of pipe. That short section of pipe is the b-pipe. The reason to go Long tube headers (if you don't have to go through emission's), is because it eliminates the primary cat (while giving you some extra HP too). The primary cats are prone to failing. If he has a 4x4, then he has a second set of cats in the b-pipes. If that's the case, then after doing headers, install the factory set of sensor's (sensors in the bpipes) behind that second set of cats. Or, buy 2 magnaflow high flow cats, and install in place of the OEM second set of cats. Then still move those sensors behind the magnaflows. All this talk of sensors and second set of cats, is all relative to if you install longtube headers. You can also install some JBA shorty headers, and have cats welded to them and installed in place of the OEM exhaust manifolds/cats. This will require some fab work and welding though. LT's just bolt right in. I know it seems confusing, don't hesitate to ask if you have any more questions.
Sold2005 Crew Cab...13.735 at 99.15 NA and 13.338 at 103 100 shot
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