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We did quite a bit of testing a number of years ago when designing our systems. We found that by just changing to straighter pipe going to the mufflers, We could gain about 13 RWHP and 20 RWT. This was on stock turbo cars. One of the cars we tested this on was member WXY and the info and dyno chart should be in search as the results were posted.One 90 degree bend has the same effect on exhaust flow as adding 25 feet of straight pipe. Turbos hate backpressure!
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