1970coupe

What is the loudest exhaust to run for a gt 4.6 but will pass inspection. I understand running no cats will make it alot louder but what is the least restrictive cat that will work for inspection and whats the loudest exhaust setup. I really want a raspy mean exhaust so i was thinking Longtubes to 3" piping all the way back to some kinda of LOUD muffler like a single chamber flow or super 44. I dont care if i lose torq, i wont be racing. Any idears or sound clips

Chubstang

catted X pipe with LM1's. Loud and legal, lot's of rasp. no need for 3" pipes either.
I have LM1's with catted h. > http://s171.photobucket.com/albums/u...LM1CattedH.flv

1970coupe

hm yeah sounds pretty nice. im in love with the 3" piping and i made the mistake on my 1970 with going with 2.25 and it wasnt loud at all $1000 bucks later so im definetally going with the bigger tube and LT headers insted of shorties. What about a 3" SLP? do they make such thing? Also is it legal to have a non-catted x. isnt it called an O/R x pipe?

1970coupe

is slp the loudest? how about single chamber flows?
heres the3" slp exhaust i found
http://youtube.com/watch?v=HPPP517Gt80

cubsstang14

the slp lm1's and a h-pipe will be the loudest, but using longtube headers won't pass emissions. You'll have 2 use stock or shorty headers.

1970coupe

eh not to keen for those goofy shorties. are you sure the lt wouldnt pass? they come with the sensors built in. how about cats? whats themost openhighflow cats?

mikemc04gt

I have no idea if this will pass inspection, but straight pipes behind the stock catted H (a.k.a. muffler delete) sounds pretty darn good IMHO.

1970coupe

hmmm. yeah. you only need two cats correct? they came stock with 4? whats the best highflow cat? Im thinkin 3" pipes longtubes and like a single chamber muffler

vanquish

yeah i've heard you only do need the two cats and no engine light will come on.

1970coupe

can you do two high flows? I really hate cats. idealy i would like two at the most. Whats a good high flow cat? ill probably just bring the headers, 2 cats and 2 mufflers to the local exhaust shop and have them build the 3" piping out the back with an h or x. so an h will be louder and an x will be raspier but quieter?