Any differences between a y87 and a stock v8 muffler?

[MustangEater8251]

Are they the same muffler? Or are they different? I know av8 muffler will give a little more sound then stock(my old car with one off a z28 did)

Also whats a y87 I-pipe size?

Before you ask I want a y-87 muffler because with lsd, I wodul need a muffler to run "stock" in a local autocrossing car club.

and if its the same as a v8 muffler, I can probably get a v8 muffler cheaepr nad easier then a y87 muffler.

[Dominic]

V8 mufflers are 2.75 inlet, Y87 are 2.25

[MustangEater8251]

hehe I know that any other?

[articacid]

hey eric so you had a z28 muffler on your 3.4?

[MustangEater8251]

I had a z28 catback on my 3.4L...

BUt that is not what got my times... I ran faster with another setup and with a cutout on the y-pipe with a partial block off plate.

Though the z28 catback sounded deep and mellow, and had more gains then a flowmaster muffler on the stock I-pipe.

[FloydSummerOf68]

I thought a post was up a few weeks ago about this...differences between V8 and y87 exhaust.