Yonaka 2.5" Stainless Catback Exhaust System - CL7/9 Gauges Replacing the factory proportioning valve

Replacing the factory proportioning valve / block with our Adjustable Bias Valve

Due to the many differences in each customer's car and setup

raising peak power 700 rpm higher than what Pro 2+ Camshafts allow for

First introduced in 1999

all at a competitive price

Yonaka 2.5" Stainless Catback Exhaust System - CL7/9 Gauges Replacing the factory proportioning valveYonaka 2. 5" Stainless Catback Exhaust System CL7 9 This Yonaka Motorsports catback exhaust system is made of fully polished stainless steel, with 2. 5 OD mandrel bent piping, and 3. 5 tips. Expect a quiet, clean, deep hum, without that irritating mid range raspy sound. Direct bolt on fit. All installation hardware is included.