I'm wondering if it would be advantageous at all to bore my GSR TB? If I were to have a shop do that, I'd obviously need a larger butterfly. If it would be worthwhile, what size should I go to and where would I find a larger butterfly?

Thanks! :wiggle:

 

based on your dyno numbers, the car is boosted, boring your tb will not do much, forced induction takes care of minor inefficiencies in the tb and intake. If the car was NA, you might see more improvements..besides, I would just buy a larger tb instead of trying to bore the GSR tb...

 

I've always been told that about the TB and that's why I've kept the OEM GSR. Thanks for the info Jan.