Stainless Works 4 way collector 2-1/4in inlet 3-1/2in od outlet - FC4225-350 fits_1999-2004`Audi`A6 This flow improvement accounts for

This flow improvement accounts for the double digit horsepower increase and even greater potential if the engine is modified with induction upgrades because all Borla(r) exhaust is tuned to maximize the output of any aftermarket performance upgrade

ARP 1993-2000 Ford 4

PTFE Lined Aurora Rod Ends

Short Ram Air Intake Design

Stainless Works 4 way collector 2-1/4in inlet 3-1/2in od outlet - FC4225-350 fits_1999-2004`Audi`A6 This flow improvement accounts forMade from 304 stainless steel for maximum corrosion resistance. This 4 way form collector with a smooth flow taper. With a 2 1 4" ID primary size inlet and a 3 1 2" OD single outlet. These collectors come with a lifetime warranty and proudly made in the USA.