Originally Posted by leadfootdriver
I have Dynomax Ultraflo's. How quiet would a Twin Turbo car be if I added some bullet muffler to the midpipe?
I'm thinking sleeper car with a quiet exhaust.
I just added dual 3" Borola mufflers Y'ed from a single 3.5 downpipe outlet. Welded it up myself out of Summit and ORiley parts.
I ran it a pass or two the other day, and everyone says it just makes a whirring wind-rushing noise. It sounds about like my 2014 Mustang stock exhaust at idle.
The data log shows no change in time to get boost (off fast idle 1 second to 15 psi and 1.2 seconds to 22 psi), and no change in boost levels or fuel use, but I would not know if the power changed without doing a before and after back to back dyno pull.
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)