I am about to get pacesetter longtubes and was wondering how much power I would lose by going with the 3 inch ORY with single muffler dumped before the rear axle VS xpipe true duals dumped before axle?

 

its all depends and what supporting mods you have. running true duals depending on the mufflers you have might not be enough back pressure resulting in crappy performance.

 

I just have the mods in my sig.I plan on getting a mail order tune once I get the headers. I thought the ORY would be easier and cheaper and still provide modest gains?

 

For you basic bolt on car both setups provide nearly identical performance gains. The only real advantage to true duals is the sound, and by that I mean that it sounds like a V8 should.

 

whenever i had my longtubes and exh. put on i ran open headers for a couple days before my app. to get the rest put on (i did the headers myself) and it ran like **** bc of no back pressure. once the rest was put on it was just fine. oh yea i ran a custom ORY and loudmouth

 

Less backpressure does not equal less performance, this has been discussed many times over.

The poor running you described was probably due to the fact that your O2 sensors were right at your collector ends, and while running open headers they were able to be exposed to fresh air at times instead of exhaust, causing erratic fueling/mixture problems. Basically the car was not able to moniter what the motor was doing and was trying to correct for an extremely lean condition or something of the sort.

 

Mods are in my sig, shooting for 400RWHP after tune.
Never ran true duals before but this setup seems fine to me. (a little too loud now after motor swap)

If you just have the mods that you listed then you should be fine with the LT's,ORY and dumped

 

What kind of muffler is that? I need some recomendations on a single muffler for my new ORY. Im looking for something that flows well but is still fairly quiet at a decent price, Anyone have any good ideas?

 

So you are just going to have a muffler put at the end of the ORY, or are you looking at an entire catback system?

 

Just a muffler and probly a small strait pipe off the muffler.

 

its a spintech muffler but let me tell you its pretty loud. Even before my motor swap it was still kinda loud with the original 5.7L
Im looking at getting a mangaflow bullet muffler and extend the piping a little bit more.

 

Do you think I could fit a summit turbo muffler in there?

 

This is the one that im looking at. Im sure the summit turbo muffler should be fine in there as long it clears everything. The diameter on that Magnaflow bullet muffler is 4" and since my car is lowered 2" i dont have much space

http://store.summitracing.com/partde...5&autoview=sku

 

"its all depends and what supporting mods you have. running true duals depending on the mufflers you have might not be enough back pressure resulting in crappy performance."

what a newbie....

how many times has that been discussed?? ugh!!!

i ran 3" duals, Xpipe, dumped with no mufflers for 6 months...had no problems with power.
so tell me again how a lack of backpressure is bad??


in all honesty...a ypipe setup like you're talking would probably lose about 10hp in the top end compared to an Xpipe setup.

probably not enough to worry about.

 

Backpressure? Who wants that? With the X pipe you will get savaging, this will create a vacuum on the exhaust valves and help pull out those gases.