Rev9 4.5" Catback Exhaust + 3" Race Downpipe for Subaru WRX STi 02-07 91-93 25HP gain over OEM exhaust

25HP gain over OEM exhaust

GS300 93-97

The pillow ball helps with rigidity and reduce any play found in rubber bushings

Mazda Miata MX-5 16-17

Rev9 4.5" Catback Exhaust + 3" Race Downpipe for Subaru WRX STi 02-07 91-93 25HP gain over OEM exhaustFull stainless steel catback exhaust + downpipe, made by T 304 stainless steel polished up to 15% lighter then stock exhaust 4. 5" tip design and 3" piping provide great deep sound CNC machine flanges for strong solid support & TIG weld for strength and durability Straight thought design on factory hanger position for a simple bolt on installation Increase 20 30 horse power and torque (dyno proven) Included removable silencer to adjust exhaust sound