Trying to keep it a sleeper

[moose]

Going to have my olds 307/200 swapped out for a sbc383/th400(bop) in my 85 Cutlass. I like the way it looks with the single tailpipe, but of course it must have dual exhaust. I'm wanting to know if a single tail pipe would be less effecient/reduce HP versus have two pipes out the back.

I'm planning to have each header run into a separate converter (I've been looking at the compact ones by PYPES), have the exhaust run into separate mufflers (with an x-over along the way), and then into a Y pipe for a single dumpout.

Thanks in advance for the input.

 

[shotgun]

Don't discount a large single exhaust. Remember when Fbodys were running a single 3" and making over 450 HP.

If done properly it will do as well as a dual sytem and it will wiegh less.

Run a single 3" to a 3" muffler, reduce to 2 1/2" either before or after the axle with a flowmaster tampered reducer, 2 1/2" madrel bent tail pipe.

Another option is to run true duals to a traverse muffler after the axle with a single outlet. looks for camaro mufflers.

The further back in the system the "restricition" the less it will effect output. By the time you reach the axle, flow need has been reduced to 1/2.

I know dynomax makes them like this.

I started working P/T at Pypes and can see what they have to offer Wednesday.

 

[carmangary]

I'm not an exhaust expert but I assume that you could simply just use a larger diameter pipe if you want a single exhaust and not restrict flow.

 

[dogsht]

He is saying a nice dual setup with a Y into a single tailpipe. Can this be done without major restriction. Yea but it would probably require a 3" single tail pipe.

 

[Phoenyx]

I seen on a TV show (I forget what one) on a car called project 'blue hair' the guy ran his duals. He had them dump behind the rear wheels. But they didn't hang down low enough to be able to see them unless you were under the car. Then he cut the tip off his original exhaust and tacked it to one of his pipes. So it just looked like he had the factory small single pipe.

 

[shotgun]

dogshit, funny you should say that. My 70 Lemans Sport exhaust was like that factory, y right before the single muffler. Atleast it was easy to convert to dauls.

Anyway, I mean shorty headers, extensions run like stock merging around where the cat would normally be, then 3" back to the muffler, etc etc.

A couple Fbody guys are running systems just like this and are in the mid to high elevens.

 

[moose]

Don't discount a large single exhaust. Remember when Fbodys were running a single 3" and making over 450 HP.

If done properly it will do as well as a dual sytem and it will wiegh less.

Run a single 3" to a 3" muffler, reduce to 2 1/2" either before or after the axle with a flowmaster tampered reducer, 2 1/2" madrel bent tail pipe.

I'm definately a rookie when it comes to auto mechanics, so please excuse my lack of awareness of the Fbody single exhaust era. I'm liking the idea of running a single 3" tho. It'll save me money on having to buy double mufflers and on having someone modify the crossmember. Any advice on a cataylac converter? I asume I want a high flow version, the only ones I've come across are by Magnaflow.

If anyone thinks that a true dual system would still be better, please speak up. No offense Shotgun, as a rookie I obviously want all the input I can and I don't want to sacrifice performance for looks.

 

[shotgun]

Depending on how much emission stuff you need to keep there are a few options. I have the Edelbrock T.E.S. headers.

Do a "google" search. If you don't need the sniffer stuff, duplicate it with shorties and a couple custom bends.

I ran a Monte SS hi flow cat, at present the one on the car seem to have had all it's guts fall out. 8)

It is 3" all the way out from there.

A small tampered reducer right before the tail pipe exits under the body to run a 2 1/2 tail will have little to no effect on performance.

Another thing is to look at what diesel pick up are running, large single exhausts.

I think outside the box and try different things so no offence taken , you m#$##87 F76869 B#$&^##.

 

[moose]

Depending on how much emission stuff you need to keep there are a few options.

I'm not required by law to have the EGR stuff and plan to remove it all. From what I understand, the only drawback would be the check engine light constantly on.

I ran a Monte SS hi flow cat, at present the one on the car seem to have had all it's guts fall out.

I've heard of this phenomenon. If the guts of my stock cat were to fall out would that allow enough flow for the performance I'm looking for? Or am I better off just getting a hi flow cat? Sorry for all the questions, but you know how we MFB's are :lol:

 

[kyhunter89]

if the 383 is built decent, id run LT into a 3.5" Y with a single muffler (a big one for the sleeper effect) with a 3" exit with no tip, but bare exhaust angled at factory position.