DragonPL

I'm debating Steeda vs. BBK Underdrive Pulleys for my 09 GT.
Comments, pros-cons ??

Thanks

jpplaw

At one point before I went FI, I ran the Steeda UP's. Good quality parts. Engine will rev much quicker. I don't have any personal experience with the BBK's. One issue you may run into with UP's is that the headlights may dim at low idle but its not that a big of a deal.

Dino Dino Bambino

Both are SFI approved and top quality so it depends on whether you prefer the stealth look of the black Steedas or the bling of the chrome BBKs. I went for stealth.
Pros: Both will net a ~9hp gain and a small gain in mpg.
Cons: None except a $250 lighter wallet.

Underdrive pulleys have been known to cause charging problems and the engine to run hotter at idle on some car models (solved by raising idle speed) but not on the 05-10 GT.

808muscle

I helped install some BBK pulleys on my friends 06GT. Really nice item. I say get those. Having an impact guy helps the install go much quicker.