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Borla Hush Cat-Back Exhaust 2002-07 WRX and STI
New from Borla, the Hush system is perhaps the only cat-back on the market that is designed for low noise. It doesn't give up anything in terms of power (the piping size is a full three inches), but the deep tone is quieter than most other after-market systems, and nearly as quiet as stock. Like all Borla systems, it's made entirely from T304 stainless steel, and is backed by the famous Borla Million Mile warranty. The twin rolled tips give the car a subdued, tasteful look, and the 3" high-flow resonator plus the specially-designed muffler keep the noise down -- very stealthy!
Measuring 20" back from the exhaust outlet, we recorded 80 db at idle, and only 88.5 db at 3,000 rpm. The stock system is 87 db at 3,000 rpm!
Like all Borla systems, the front of this cat-back has a donut gasket receiver, so it's a perfect fit to your factory downpipe. If you want to attach it to an aftermarket flat-flange downpipe and have a full 3" system all the way through, purchase the 3" downpipe adapter accessory below.