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Well, from what I understand, they provide a thermal insulating barrier between the intake collector and the engine block, thus preventing the heat off the engine from getting up into the intake/collector. The idea is to keep the air cooler as it enters the engine, thus providing a horsepower increase, especially after the engine is hot. They claim a 4-8hp increase. I'm not sure I've ever read any "glowing testamonials" about them, but I figured if I had to remove the collector anyhow, this would be a fairly painless mod, and hey, a few extra ponies is never a bad thing.
Cappy
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Cappy
'94 LSi Barcelona Red 158,000 miles
'92 LS-L Dark Teal 47,000 miles
'95 Olds Acheiva 104,000 miles
'85 Audi 4000 135,000 miles
'87 Supra 129,000 miles - 2nd JDM engine
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