The COBB Tuning turbo downpipe is one of the premier modifications most owners look to upgrade on their vehicle. By opening the diameter of exhaust flow coming out of the turbo, the COBB downpipe unleashes more power potential over the stock restrictive unit.

Fits: Subaru STi 2008<...

The Harman Motive 2008 STi catback exhaust features full 3-inch mandrel bent 304 stainless steel piping throughout for optimal flow and longevity.

Our top quality turboback exhaust has been proven to make an extra 10 peak horsepower and torque at wheels with no tuning. When pro-tuned to Stage 2 using the COBB AccessPORT, gains of 35 horsepower and 62lb/ft of torque were seen.

The Harman Motive downpipe with hi-flow cat substantially improves performance and responsiveness by replacing the 2 restrictive factory cats with 1 high flow unit.

The Harman Motive External Wastegate Uppipe (EWG) uses a Tial 44mm wastegate to control boost on even the most stuborn turbos. Using an EWG eliminates issues with boost creep and can even make more power than a traditional internally gated turbo.

HKS Center Pipe 65mm (SUS304) SUBARU Impreza WRX STi 2008

Application: SUBARU Impreza WRX 2008 ; SUS304 Center Pipe ONLY/ for use with 31021-AF011 and Stock Muffler
Part No. 33004-AF002
Piping Dia. (mm) 65

***Pictures may not be actual product***

For maximum exhaust flow and quicker turbo spool up, HKS offers downpipes for racing use. Each mandrel bent down pipe is a bolt-on application that will mount to the stock turbo and/or to a HKS turbo upgrade kit. Certain HKS Downpipe applications are made from coated stainless steel or polish...

HKS Exhaust Legamax Premier 2008 WRX STi (Rear Section)

Part No. 31021-AF012
Tip Dual Ti x2 (rolled)
Tip Dia. (mm) 90
Piping Dia. (mm) 65

***Pictures may not be actual product***

Legamax Premium Exhaust

Instantly improve horsepower and throttle response!

HKS Stainless Steel tubular turbo exhaust manifolds offer maximum exhaust flow for increased turbo spool up & phenomenal flow capacity. Fabricated of polished SUS304 stainless steel and flanged to mount an HKS wastegate for unsurpassed boost management.

HKS Set-Up Kits are ...

08-UP SUBARU WRX/STI RACING CAT-BACK

Item No. HS08SW1GTR

Piping Dia.:76mm

Tip Dia.:101mm...

08-UP SUBARU WRX/STI TITA. TIP N1 CAT-BACK

Item No. HS08SW5GTT

Piping Dia.:76mm

Tip Dia.:101mm

08-UP SUBARU WRX/STI TITA. TIP RACING CAT-BACK

Item No. HS08SW5GRT

Piping Dia.:76mm

Tip Dia.:101mm

Subaru 08-UP WRX/STI Divorce Waste-Gate Down-Pipe

Item No: HS08SW1DPN

Subaru 08-UP WRX/STI With High Flow Cat. Down-Pipe

Item No.:HS08SW1DPC

Improve horsepower and increase throttle response instantly!

TECH TIP: Direct bolt on - includes gaskets, bolts, and everything else for an easy installation.

Fits: Subaru WRX STi 2008-20...

Megan Racing Stainless Steel Downpipes are made of the same High-Quality T-304 that is featured in our Headers and Turbo Manifolds for extreme durability and resistance to corrosion and cracking.

Megan Racing Stainless Steel Downpipes are made of the same High-Quality T-304 that is featured in our Headers and Turbo Manifolds for extreme durability and resistance to corrosion and cracking. The missing component between any Header/Manifold and your Cat-Back system, these Downpipes will ...

If your factory catalysts are tired, broken or missing PERRIN™ now offers a replacement catalytic converter that is approved for all states that do not require CARB approval.

Utilizing 3” 304 stainless steel, polished to a mirror finish, these are an excellent alternative to the in...

The advantage of the External Wastegate is to help the turbocharger operate more efficiently. This is done by relieving a large amount of back pressure pre-turbine housing.

Less restrictive turbine housing will allow you to run higher boost pressures which typica...