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Old 07-14-2012, 05:20 PM
bigbutterbean bigbutterbean is offline
Join Date: Jan 2011
Location: Lebanon, PA
Posts: 2,420
Default Re: First build on China

Pshhhhh. I hate the way harleys sound with straight pipes. Ought to be a law against it. A 66 ht is nowhere near as loud as a harley, but still, not having enough back pressure will throw off your timing and the engine will not run correctly. Either get a new muffler or an expansion chamber. The expansion chamber will give you some performance increase, but there is some tuning involved. The shorter the had pipe, the higher thr rpm it will take to get on the pipe. So with a short header, it will only kick in around max rpm. With a longer header, it will kick in at lower rpm without affecting your top speed.
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