Anyone have experience with Spintech mufflers?

[Joe-JDC]

Four Valve engines, including the Mustang GTs sound terrible with Spintech mufflers.  Stock Ford sounds much better, regardless if there is a horsepower improvement with the aftermarket mufflers.  Give me a good pair of Dyno Max, or Borlas any day.  Joe-JDC

[My427stang]

I have a buddy with Spintechs on a 347 inch Boss 302, it sounds wicked, but not real pleasing inside.  I am a Borla man mysel

[Hemi Joel]

The spintechs I had sounded like air leaking from a compressor hose. I got rid of them

[cammerfe]

On my 390/'53 F-100, I used a set of '64 Galaxie 427 exhaust manifolds. I did an immediate change up to 3" exhaust, did an 'X' pipe and had Bassani make me a pair of 36''-body stainless mufflers. The mufflers were hung just ahead of the rear pan, with down-turns to get past the sheet metal. I regularly received compliments on the sound.

KS

[Hemi Joel]

Dan, it there any reason not to go with sidepipes and eliminate the under-chassis exhaust altogether?

[philminotti]

I can tell you my reasons for a full undercar exhaust...
1.  Quieter.  If you've never driven a side pipe big block cobra, well, you need earplugs.  I have.  It's absurdly loud and that's a fact.
2.  I have kids.  It's safer.
3. It's classy.  That's just my opinion.

[cleandan]

Dan, it there any reason not to go with sidepipes and eliminate the under-chassis exhaust altogether?

Yes. This is an original 1967 427 street Cobra and it came equipped with under car exhaust, nor does the owner desire side pipes.