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Discussion Starter #1
What is the size of the stock Throttle body on our cars? (04' GTO)

I saw an after market one today that was 90mm. That seems awefully big.
 

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I wouldn't bother with a larger TB unless you're putting in a FAST LSX intake manifold...otherwise a nice port/polish job on our stock TB's is good enough.
 

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How much do you think a nice port/polish job of the stock TB would actually help? Above was posted that a 90MM is good for around 7-12 hp so how much would you gain with a 78 or 80MM TB or would port/polish the stock put us at that?
 

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It's not a mod that I would put on the top of my list. It'll yield you an extra few ponies, but don't expect huge results.

P&P'd TB goes for ~ $150+

Personally, I don't buy the above claims (no offense, I just don't think it's realistic). If you go with a FAST LSX intake and 90mm TB you might yield 12hp. Most only show those gains if they're running FI or H/C.
 
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