Jtm2085

iTrader: (1)

I originally had a TSP y and GMMG catback on my car and loved it. After the addition of a rather rowdy cam shaft, I could not handle the rasp and drone any longer. I also felt like the reduction in the y pipe was holding me back as well. I liked the idea of true duals but did not want them to be dumped and couldn't find a decent shop to run them over the axle. I found a used mufflex system with a cut out and custom 3in to 4in y pipe locally for a great price and snatched it up. The result is night and day difference. Zero drone or rasp and a much deeper and better sounding tone. It has a flow master muffler as well. I would really like to get back on a dyno and see how much power I picked up. Any guesses? Attachment 510423

blk00ss

iTrader: (66)

I bet you lost power. The flow master muffler they use is horrible. I had the spintech muffler on mine when it was a 404". It made 474 through the muffler. Added a cut out and it made 497 with it open. Get a 4" cut out or maybe replace the muffler with a Borla XR1, like I did.

Mappinsj

I had my true duels done with a crush bender over axle. Not easy job, if my friend wasn't the one who did it he said he wouldn't have done it otherwise. No drone, no rasp, no loss in power (only bolt ons) paid less than a Texas speed Y pipe for it. What state are you in

Jtm2085

iTrader: (1)

That's funny you say that because I read the exact opposite. That the spin tech was terrible and how a guy picked up significantly by removing it and that the magnaflow and flow master were better? I dunno, but it does have a cut out already installed. So that's good!

Jtm2085

iTrader: (1)

I'm in Alabama

blk00ss

iTrader: (66)

I don't see how the flowmaster could be better than the spintech. It's a chambered muffler just like the spintech. Any of the straight through race mufflers will be good.

Paul Bell

iTrader: (9)

Unless you have a really big engine, going to 4 inch won't garner you any gains over the GMMG. A Flowmaster or Spintech muffler would have slightly more restriction vs. the GMMG chambered exhaust.

Snake_Skinner

iTrader: (12)

How much for the GMMG, since you don't need it and all?

Jtm2085

iTrader: (1)

Mufflers aside,how can that be true if SBE cars always make more power going to a true dual?

Mappinsj

I got you bro

http://m.ebay.com/itm/161806717057

Rasp away! But move fast like.....

thunderstruck507

iTrader: (18)

Depends on the setup. It doesn't take as much as you would think for a 3" single to start becoming a restriction. Hence why so many cars are gaining power with a cutout.

3" y to 3.5"-4" single without a cutout is lighter but still increases the flow

TyCZ28

local buddy with a heads ms4 cammed 99 trans am that had 1 3/4 SLP headers slp y and an a loudmouth1 made 425 on that setup. Ripped it all out went with TSP 1 7/8 longtubes, custom 3" mandrel y pipe and a flowmaster merge into a 4" catback with no muffler and the after dyno lost 4ftlbs of torque but horsepower was 458 after.

Paul Bell

iTrader: (9)

Most engines need the exhaust flow speed in the pipes to be high to produce scavenging. Larger piping tends to slow the exhaust flow reducing scavenging. This is not always the case but most of the time it is.

Jtm2085

iTrader: (1)

I'm just curious how cars switch to true duals or run a cut out and produce more power then?

Mazzenger

iTrader: (5)

I'm a fan of cutouts. I have a manual cut-out. I don't mind crawling under and capping it.
I have a garage built 3 inch catback with a hooker maxflow muffler. When I open the cut-out it picks up 14hp and 18 lbtq all over. For $25.00 and a little sweat, its a heck of a deal.

Full-Force

iTrader: (11)

Im gonna have to respectfully disagree that a single 3" catback is gonna produce same power even on a bone stock setup.

Jtm2085

iTrader: (1)

So you are agreeing with me then lol?

Full-Force

iTrader: (11)

yes sir