exhaust upgrades

shadow800 · 07-20-2011, 07:28 AM

I am looking for some advice i have a 83 911 sc 3.0l i am looking to change exhaust to dual outlet any advice and also this car is not an everyday driver can i remove heat exchangers and run just headers with a muffler any help is greatly appreciated

JoeyD911 · JoeyD911's Garage

I've heard sc's with headers through a two in two out muffler. Boy was it loud. I would go with SSI or equivelent heat exchangers with the muffler you want. Of course this is if finances allow, thats the only reason I still have stock exhaust. Damn mortgage!

shadow800 · 07-20-2011, 08:03 AM

yea i hear that i have bought cars for less than a porsche muffler hahahaha yea doing some investagating hey do i need the heat exchangers if you do not use the heater can u run just headers and is this wise? this car never even sees rain let alone snow?

ShakinJoe · 07-20-2011, 08:12 AM

If you do need heat headers are cheapervand you can find a decent used set here. Having them ceramic coated is a good idea.

Search threads with the word exhaust and you will find a plethora of info ranging from $100-$800 for the exhaust.

Good luck.

shadow800 · 07-20-2011, 09:33 AM

awesome thank you for the all the info

shadow800 · 07-20-2011, 09:41 AM

ok another question i am new to working on a porsche had chevys in the past easy fabricating how can i and how hard is it to say leave original exhaust pipes on car but get a 2 in 2 out muffler like that look i have read going to headers and some mufflers u actually loose power?? right now its single out can i just change the muffler?

will hung · 07-20-2011, 10:10 AM

If your 83 Carrera SC has the original exhaust, the exhaust routes into a cat, therefore, you have 1 pipe inputting to the muffler, so you can't get 2in/2out. You can cut into the stock muffler and add two outlet pipes. There are pictures floating around showing how you cut into the canister, weld in the pipes, and weld it back shut. That picture was for a 2in/1out oem muffler, so I don't know if it would work on a 1in/1out.

shadow800 · 07-20-2011, 10:17 AM

cool thanks Will yea it is original exhaust so unless i change the pipes or spend 700 bucks for 1 in and 2 out muffler i would have to cut and weld hum porsche parts expensive i mean its just a muffler i have bought whole cars for less than that

Oh Haha · 07-20-2011, 01:38 PM

Think like a hot rodder,man!!!

I used a 1in1out FloPro muffler(sounds/looks like a Flowmaster). I have the Euro premuffler with stock heat exchangers. If you can weld or have a friend that can, you can make your own setup for less than $100.

check out the ultimate exhaust thread here. I have some video posted there.
The ultimate exhaust sound clip thread!

FinallyGotOne · FinallyGotOne's Garage

well, if you are running an 83 and have to get through emissions, I'd be careful about doing too much to the exhaust. I don't have to do emissions and I have a 74 911 muffler and 74 911 exhaust system on my car. The 74 exhaust is basically two uneven curved pipes (think header) without catalytic converter, two out style, going to a 2 in 2 out (was a 2 in 1 out) muffler. The heat shield allows me to use my cabin heater still. If you do not care about cabin heat, then I think your fine to go headers or a 74 exhaust set up, just plug the heater hose holes in the engine bay tray so you don't kick up a lot of water or road debris (gravel, sand) up in the motor bay.
Once you set up a 2 in 2 out exhaust you'll see an increase in power. Those mufflers can get expensive though. But I have been told that you can use most mufflers that will fit back in there. Some also remove the lower valance completly and polish or paint their muffler so the fit is not a concern.