Re: Magnaflow Muffler Disatisfaction
My car is a '68 with 454 (alum heads, roller cam) and Hooker Super Comp 2" headers, 3" X-pipe, reduced into 2.5" mufflers and full tails. Engine is around 525hp.
Interior resonance is my biggest gripe, and I have been trying all kinds of systems in the last few years. First was Flowmaster's American Thunder 2.5" H-pipe system with 40 series Deltas and tailpipes just behind rear wheels. Wicked loud inside and out, just way too loud overall. Then added Flowmaster full tailpipes exiting out rear. Better but still too loud. Then went to 50 series Deltaflow mufflers, real nice sound outside car but still the resonance. Then went to 3" X-pipe, retaining the 2.5" 50 series mufflers and full tails. Awesome sound outside, but interior resonace still there.
Then went to Magnaflow straight-through mufflers; worse interior resonance than the Flowmasters, plus they just plain sounded crappy to me. The Magnaflows lasted a grand total of about 30 minutes of driving for me.
I switched back to the Flowmaster 50 series and added some Car Chemistry inserts into the collectors, which really helped with interior resonance. Flowmaster sound is really nice, especially when it stays outside the car, LOL.
Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970