2 x 3" Inch Copper Header Exhaust Collector Gaskets Flanges Universal 3 Bolt USA Transmission Upgrades Our blow-off valve is a

Our blow-off valve is a dual-stage pull-type relief valve

5-1 inch difference due to manual measurement

B 2008 Subaru Legacy GT spec

Try both and decide what is best for you

2 x 3" Inch Copper Header Exhaust Collector Gaskets Flanges Universal 3 Bolt USA Transmission Upgrades Our blow-off valve is a2 x 3" Inch Copper Header Exhaust Collector Gaskets Flanges Universal 3 Bolt USA FITS ALL 3" COLLECTORS WITH TRIANGLE (3 BOLT PATTERN) MADE OF SOLID COPPER . 041" THICK REUSABLE, NO SEALANT REQUIRED SEAL PERFECTLY EVERY TIME BY CREATING A TIGHT LEAK PROOF SEAL BY USING A CLAD O RING DESIGN THAT WILL LAST! BOLTS ARE NOT INCLUDED THESE GASKETS PROVIDE AN EXCELLENT SEAL & WE GUARANTEE IT! SOLD AS A PAIR (2 GASKETS)