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Hey Mike -
3.5" exhaust all the way back? No wonder they are loud! With that pipe
diameter (and a healthy motor) just about any muffler is going to be loud.
Before I went with my current full 3" system on my Chevelle, I had 3" headpipes
and 2.5" tailpipes, and I was told that changing to 3" tailpipes with the same
mufflers would result in a significant increase in volume and resonation. So,
since I didn't like the mufflers I had on there anyway (Flowmaster 30 series), I
went with the full 3" system and the big block 70 series mufflers (quietest ones
they make). Good thing I did because I can only expect the exhaust to get
louder and resonate more with my new 427 SBC. What kind of motor do you have in
there that you need a 3.5" system, anyway? A 3" system should be more than
enough for most street engines <grin>.
Cliff Klimas Hamilton, NJ
'71 Chevelle (new 500+hp 427 SBC project ongoing)
'88 CSC (daily driver and cruiser)
> I bought 2 of Spintech's 2nd to quietest muffler. Put them onto 3.5"
> exhaust, and it's incredibly loud! Louder than my SBC race car with 3" open
> exhaust. The Spintech rep insists that if I use 3" tubing, with 2.5"
> exiting the mufflers, it will be MUCH quieter. He even offereed to modify
> the mufflers for free, to accomodate the 3" inlet and 2.5" outlet.
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