{"id":2400,"date":"2015-05-18T22:56:08","date_gmt":"2015-05-19T05:56:08","guid":{"rendered":"http:\/\/www.rhoadescamaro.com\/build\/?p=2400"},"modified":"2015-05-18T22:56:08","modified_gmt":"2015-05-19T05:56:08","slug":"exhaust-work-and-dyno-session","status":"publish","type":"post","link":"http:\/\/www.rhoadescamaro.com\/build\/?p=2400","title":{"rendered":"Exhaust work and dyno session"},"content":{"rendered":"

Street Touring rules allow for headers but we must retain catalytic converters no further than 6″ down the flow path from the stock unit.\u00a0 In the previous post detailing header install the Berk high-flow cats (which sit in roughly the stock place but are much shorter in length) went bye-bye.<\/p>\n

Spent the morning at A&A muffler<\/a> here in town (and recommend them if you need exhaust work done in San Diego) – first project was to get a new pair of high flow cats welded in just aft of the new longtubes, where the garageline mid-pipe provided a flex joint.\u00a0 These cats are 100cpi high-flow units from my buddy Rick at Ciro Racing<\/a>. Given how far back they are, and how large and not dense their cell structure, they should be providing very little backpressure.<\/p>\n

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From there it was back to where garageline provided a pair of resonators.\u00a0 They have a ~10″ body length and help knock the noise down a little – but there’s room for more.\u00a0 The garageline midpipe provided a great canvas for the next evolution of the car’s exhaust.<\/p>\n

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Inside view of one of the resonators removed:<\/p>\n

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In their place, a pair of 2.5″ 17″ long Burns Stainless single-stage mufflers.\u00a0 Very lightweight but also very effective.\u00a0 Installed with v-bands to they can be swapped out for straight pipes later if needed.\u00a0 These mufflers *shouldn’t* cost much if any power but I didn’t back-to-back with straight pipes.\u00a0 I don’t think they’re any more restrictive than the resonators that were in there already.<\/p>\n

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The car is actually a little quieter now than it was before with stock manifolds, the Berks, and the unmolested garageline midpipe (kept the stock muffler on throughout).\u00a0 Hit 95db in San Diego with that setup – hopefully this gets it under, hard to say.<\/p>\n

From there, 100 miles north for a dyno touch-up at Shawn Church’s in LA.\u00a0 This is probably maxing out the iPhone microphone, but believe it or now, was a noticeably a little quieter than last time.<\/p>\n