I run 2.5" Corvette ram horns connected to 2.5" aluminized exhaust tubing.
Dual Dynomax Super-Turbo mufflers.The exhaust exits behind each rear wheel.
Oh ya,I also run an "H" pipe just behind the transfer-case.
Here are some pic's.
The muffler
the Corvette ram-horn
cross section of the tubing
the "H" pipe
looking towards the rear
how they exit
The whole system has a low,deep tone to it but really screams when you get on it
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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