Custom exhaust opinions wanted

[ryan j]

The car is a 73 with a 3.2 upgraded to 3.4 with SS1's and a stock single exit muffler. It's used for racing and there are decibel limits, but not enforced unless the car is obnoxiously loud. I'm looking for something between a megaphone and a louder dual exit muffler. Something that is sort of loud when cruising, and screams at 7k.
I tried running it with the muffler off the car, and it sounds awesome and revs like an indy car, but is just a bit too much. Plus it echoed for a while in the neighborhood, and people came out of their houses to see what was going on.

What I was thinking of was to have a local exhaust shop build me something and I'm looking for opinions on this design.

edit- stick drawing gets distorted when posted

90 bend from SS1 towards center of car into 45-90 bend up into X pipe into 45-90 bend towards sides of car and angled to exit through openings in valence

don't know if the x pipes angle out or straight up.



I need to retain heat for the car, so no headers. Also thinking that this still might be a bit loud, so maybe a glass pack between the X pipe and the tip.

[Zeke]

Your design has been executed before. No matter what you do, it will still be very, very loud. The consensus around here is a dual in, dual out Flowmaster (or equivalent) with no X pipe configuration. The muffler is the X, so to speak. Not quite the same smooth sound as a true x or siamese pipe, but it will give you the little bit of backpressure you need and some peace of mind for the neighbors and the track meter.

[ryan j]

tried to edit drawing, but it gets distorted when posted

I don't know what angle the X pipes exit at, so the attaching bends could be anywhere from 45-90 degrees.


from the SS1 exit, 90 bend towards center of car, 45-90 bend into X pipe placed vertically, 45-90 bend towards sides of car and pipe angled to exit out openings in rear valence

[ryan j]

I want the car to be loud, just not "call the cops right now" loud.

What model of flowmaster do people use or does any dual in dual out model work?

[Porschekid962]

how about SSI's to a large edelbrock or flowmaster, two in, two out? we had a regular banana muffler modified for two in two out and its nice and loud but quiet when you want it to be, and it looks stock.

[Bill Verburg]

I would recommend Coast mufflers



They do a great job of muffling this thing