TP's give more hp, they do have some rasp, and most have an o2 sensor connection so no CEL will go off. there will be a stronger smell of gas with TP's though. mine have some rasp between 2.5k-3.5k in the rpm range. to me all tp's are the same, it's just a piece of metal. to me there is no point in paying $500 for tp's, but everyone has their own opinion.
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2 plus 2 times 2 = ? ... hint, it's not 8 
Stillen CBE, Stillen Gen 3, TP's, Uprev tuned - 324whp/264tq
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