I guess it depends on how quiet you want it.
I run dual 2.5" exhaust with a pair of DynoMax Super Turbo mufflers,not that loud untill you get into it.I don't have a problem with it's sound level.It's definitly quieter than it used to be.
A second layer?I don't know.I don't think I need it.But again it's all in your own personnal preferance.
The more you use the quieter it gets.
Hell if you want it that quiet put a pair of foam ear plugs in before you get in your truck:p
Are you going for that "new car quiet"?
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71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension.
Petrolia,Ontario,Canada but working in Port Huron,MI.
See ALL my Blazer pic's HERE
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