GrimmSpeed 44mm External Wastegate Uppipe w/ Dump Tube - 2008+ Subaru STI
An External Wastegate (EWG) allows exhaust gases to be diverted prior to entering the turbo; thus creating a quicker turbo spool. GrimmSpeed's EWG has a larger diameter than the stock internal wastegate; this allows the exhaust gas to be released faster, which improves boost control, maintains maximum boost longer in the rpm range, and extends the life of the turbo. Moving the wastegate out of the turbo relieves the turbo from the massive amounts of turbulence that the stock internal wastegate creates.
The EWG Up-Pipe is built from 304 SS with thick 12mm 304 SS flanges that will not warp. The flanges have been CNC cut for perfect tolerances(no laser cutting here!). A flex section has been added; this will extend the life of the product(allows expansion/contraction of pipe without cracking) and will lead to less exhaust leaks. Users should expect gains in the 15-40hp range when tuned for the EWG set-up.
EWG Up Pipe
5 Studs for Up Pipe
2 Bolts, Washers, & Nuts
This includes all the gaskets necessary for installation.
This uppipe is not suitable for RHD cars.