Exhaust upgrades?
Just wondering what exhaust upgrades are best on these things? I've got a V8 and would like to let it breathe a little better.
Are there any legal headers, high flow cats, etc besides just catback systems? Anyone know what power gains are to be had? Lastly, any of this legal for smog testing? |
There are no direct options for headers on the Alpha due to frame/4wd clearance. You can get the colorado V8 thorley headers and modify them abit to work and thats fine since many people who instal headers that are direct fit endup having to caress them into place!
But you will loose the upper cats which will affect emmissions! |
Can duals be run or is there simply no room? Maybe high flow cats and 3" pipe is all that can be done.
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Originally Posted by Chubs
(Post 361675)
Can duals be run or is there simply no room? Maybe high flow cats and 3" pipe is all that can be done.
Check this |
Best bang for the buck is a MAGNAFLOW CATBACK. The thing that helps most is that it replaces the restrictive “flattened” stock crossover under the transfer case. That alone is worth measurable hp in addition to 3” diameter from the collector, the zero restriction resonator and well designed muffler. Because the full diameter crossover is closer to the transfer case tailpiece, not a bad idea to wrap it in header shield held in place with stainless zip ties.
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Excellent stuff guys, thanks!
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Originally Posted by Ordieh
(Post 361715)
Best bang for the buck is a MAGNAFLOW CATBACK. The thing that helps most is that it replaces the restrictive “flattened” stock crossover under the transfer case. That alone is worth measurable hp in addition to 3” diameter from the collector, the zero restriction resonator and well designed muffler. Because the full diameter crossover is closer to the transfer case tailpiece, not a bad idea to wrap it in header shield held in place with stainless zip ties.
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Interesting! The magnaflow sounds like a much better setup than the gm performance exhaust I bought years ago (which is also the borla one) as it onlu starts right after the merge section. Ever since my LS swap and my exhaust sounds terrible at idle and I blame it on the fact Im running 2.5" tubing all the way down and Ive read I need 3" for 500 hp!
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Originally Posted by amrg
(Post 361733)
Interesting! The magnaflow sounds like a much better setup than the gm performance exhaust I bought years ago (which is also the borla one) as it onlu starts right after the merge section. Ever since my LS swap and my exhaust sounds terrible at idle and I blame it on the fact Im running 2.5" tubing all the way down and Ive read I need 3" for 500 hp!
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Its probably true but keep in mind the H3 Alpha has 4 cat converters which contribute significantly in lowering performance. 15 hp because of a crossover is an over statement. I saw on youtube people testing headers on an LS engine after beating the **** out of them (bashing with a sledgehammer) and they barely lost power conpared to when they were in perfect condition.
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