[gt550]

im going to put headers 1 7/8 & cat back 3'' on the car so the boost will drop. so can i put a lower pulley to. i have 2.6 upper

 

[Evolution Performance]

im going to put headers 1 7/8 & cat back 3'' on the car so the boost will drop. so can i put a lower pulley to. i have 2.6 upper

Absolutely, and we have them In Stock.

http://www.evoperform.com/shop/index.php?main_page=product_info&cPath=11_76&products_id=346

You will also need a tune.

 

[Mustang_Racer]

I ordered mine yesterday and i have a 2.6 upper already.