GrimmSpeed Uppipe - WRX 2002-2014 - STI 2004-2019 - More

Subaru supplies its turbo owners with a tiny little crosspipe from the factory. 50% of your exhaust gasses are passing through this tiny pipe and, well, that's just a problem. Do not worry though, GrimmSpeed has a solution for you!

Not CARB Legal

Grimmspeed designed this uppipe using their in-house FARO Arm along with the latest and greatest Solidworks CAD software. This assures that we can offer you the most precise and best fitting uppipe on the market. In short, OEM exhaust manifold pieces are inconsistent so we used our reverse engineering hardware/software to scan countless OEM pieces to determine the range of best fitments for our aftermarket pipe. This allows us to be very confident that your flanges will be leak free and the uppipe will fit nicely.

Grimspeed's uppipe has been made with beefy local raw materials. The flex joint is 321 Stainless Steel w/ an Interlocking Liner and tubing is a heavy duty 14 Gauge 304 Stainless Steel(competitors use thinner 16 GA) that has been CNC Mandrel Bent and finished up with a nice brushed finish. Our flanges are made out of 1/2" 304 Stainless Steel and are fully machined on all sides(competitors typically just laser cut flanges for cost reductions). They also put a nice bevel on the edge of the flange so you don't cut yourself. The insides of the flanges are "cut-back" to allow the pipe to rest inside the flange which gives you a nice flush mating surface thus allowing optimal flow through the pipe. GrimmSpeed started as a porting company after all....they take pride in exhaust flow quality through their pipes. All fabrication is completed by their Welder/Fabricator who is certified in Aerospace Welding...yeah, he knows his stuff. A bit of overkill using an Aerospace Welder you say? Well the uppipe is put through some very harsh environments so we wanted the best for the job.

Spool Up: Application specific but generally you will see 300-400rpm quicker spool up

HP Increase: Application specific but generally you will see 8-10HP increase

Performance:

Flow Bench Results vs. OEM at 28" WC
OEM Catless - 244.6 CFM
OEM Catted - 164.7 CFM
GrimmSpeed - 292.6 CFM