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That is exactly the setup I have on my Box S factory muffler. That, coupled with the secondary bypass pipes makes a great exhaust. Look at the photos in my prior post. Don't know if it makes HP, but the throttle response is far better than stock. Downshift blips are immediate and without hesitation.
bmwm750; does anyone actually have realistic dyno results to prove the claims on the headers? Everything I've read doesn't make it seem worth the cost and hassle of CEL problems; hence, my choice not to go that route.
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