Monday, April 24, 2017

WRX STi: Get a GRiP!

The iconic "Boxer Rumble" of the Subaru WRX STI, brought out by Unequal Length (or UEL) headers, may be going the way of the Dodo by 2020.  When I decided to finally give mine some aftermarket exhaust, I spent a lot of time researching to find the right one.  Reading reviews, watching YouTube videos, and talking with owners helped me get an idea of the different features, designs, and brands available to get the "right" sound.  Of course, there's not really any one right answer for this.  There are trade-offs and compromises to everything, so finding the right mix is important.

For me, it came down to minimizing cabin drone and producing a throaty rumble without being too obnoxious.  When my research was complete, the exhaust I felt had the best of these characteristics was the ARK GRiP Catback Exhaust.  This exhaust utilizes Helmholtz resonators to alter the sound of the exhaust note and for differences in power delivery by adding two chambers to the exhaust.  In turn, these resonators help cancel out unpleasant frequencies of sound in the exhaust.  This technology and build quality comes at a price, so to save money, I managed to find one that was used and in great shape!

I paired this exhaust system with a Grimmspeed Catless Downpipe (now out of production), a Grimmspeed Electronic Boost Controller, an Innovate Motorsports LC-2 Digital Wideband, and had it professionally tuned by Boosted Performance Tuning.  Numbers are running around 300whp and around 330tq.  The power increase is instantly noticeable and, thanks to the added flow of the downpipe, there's a significant reduction in turbo lag.  It's also more consistent and predictable so driving it is even more of a blast than before.  Installation was relatively simple for everything.  The only thing that tends to be a pain is the STI's intercooler, which needed to be removed to install the Downpipe and heat shield.

Overall I'm incredibly happy with it.  All the sound I love without ruining the cabin with obnoxious drone.  Put up the windows and you can still talk to the passenger while you row through the gears.  Add in the music being created by the ARK GRiP exhaust and it's too easy to smile with each pull.

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