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Old Mar 5, 2006 | 08:52 PM
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Default back pressure?

i have the slp lm exhaust and i'm looking to get pacesetter lt's and ory. i know ls1's need a certain amount of back pressure and was wondering if i was going to get enough with the lt's and ory. if any of you guys have this setup let me know how it worked for you, thanks.
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Old Mar 5, 2006 | 09:43 PM
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NO! BACK PRESSURE IS BAD. Exhaust gas veolcity is good. That's why a 4" exhaust doesn't make more power than a 3". However, that setup may be too loud with the SLP LM.
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Old Mar 5, 2006 | 09:47 PM
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It will flow plenty!!!!! but will probley be unbearable.
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Old Mar 5, 2006 | 09:55 PM
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The longtubes and o/r y will be a good thing from a backpressure stand point. I just helped a friend install hooker longtubes and o/r y in front of his dynomouth setup. IMO, it is WAY too loud!! It just screams "PLEASE PULL ME OVER" LOL!
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Old Mar 5, 2006 | 10:15 PM
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well i'm not totally concerned with being too loud. i don't ever have people in my car. my only concern is performance. i was just worried about if i needed enought back pressure
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Old Mar 5, 2006 | 10:17 PM
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Nah your fine...it will make good power as well. But its going to pretty much annoying to drive (rasp)
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Old Mar 5, 2006 | 10:22 PM
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any good way to help rasp w/o loss of performance?
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Old Mar 5, 2006 | 10:29 PM
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Originally Posted by stangnightmare
any good way to help rasp w/o loss of performance?

Not really. You won't lose much performance though, and IMHO it would be well worth it. High flow cats and/or a Magnaflow/hooker catback, etc. would help alot.
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Old Mar 5, 2006 | 11:44 PM
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would you go with a magnaflow muffler instead the the slp "nothing at all" muffler. i know you can just insert it in the existing system "magnamouth?"
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Old Mar 6, 2006 | 03:31 AM
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Personally, just get a good catted Y pipe. It shouldn't really affect performance, will make it sound better as well as better db level and will keep you legal, so it'll be easy to pass emissions.

Also I'd recommend reading the sticky's in this forum, it will give you an insight into exhaust systems. From a performance stand point back pressure is always bad.
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Old Mar 6, 2006 | 03:42 AM
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Originally Posted by stangnightmare
would you go with a magnaflow muffler instead the the slp "nothing at all" muffler. i know you can just insert it in the existing system "magnamouth?"
That would probably help some. Personally I like the sound of the Borla XR-1 a little better than the Magnaflow, and would probably try that one. I also like the sound better with cats and would use them myself, but a muffler in the I-pipe should help some.
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Old Mar 6, 2006 | 05:24 AM
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Rasp sucks. The cheap way to get rid of it is to get cats. Expensive way is iron block.
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Old Mar 6, 2006 | 06:12 AM
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Here is mine. Check it out. I also feel the LS1 runs better with a little back pressure...high flow cats would be plenty. As far as it being too loud There is no such thing!

https://ls1tech.com/forums/generation-iii-external-engine/462478-pics-completed-true-dual-over-axle-exhaust-w-edelbrock-lt-s.html
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Old Mar 6, 2006 | 07:04 AM
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Zeus, I am curious to find out how good your system works without the H or X in the equation. Looks freaking clean though man!
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Old Mar 6, 2006 | 07:49 AM
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Originally Posted by orangeapeel
Zeus, I am curious to find out how good your system works without the H or X in the equation. Looks freaking clean though man!
I love it. When you really understand the principals behind the H or X pipe, you come to realize that it is not necessary in all true-dual setups. It would help in some set-ups, and not in others.
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Old Mar 6, 2006 | 08:04 AM
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are the tsp catted y's a pretty good setup with the coated pace lt's. i've been looking at them online and it seems like a pretty good deal at $700 for the whole setup.
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Old Mar 6, 2006 | 08:11 AM
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i'm also with you zeus, the louder the better. i live on ft.hood and the mp's on post aren't going to give me too much about how loud my car is. zeus your car sound great, that's an awesome setup you have there .
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Old Mar 6, 2006 | 08:21 AM
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Originally Posted by orangeapeel
Rasp sucks. The cheap way to get rid of it is to get cats. Expensive way is iron block.
ummm not too sure about the iron block comment. Most engine's now adays are aluminium and rasp isn't an issue across all powerplants.

And besides the Jaguar V12 was aluminium and it was designed in the 50's, also the Rover V8 which is derived from the Buick 215ci. Buick ceased production in the 50's and it was aluminium but TVR's don't suffer rasp.
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Old Mar 6, 2006 | 08:24 AM
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Originally Posted by 02SS:ZEUS
I love it. When you really understand the principals behind the H or X pipe, you come to realize that it is not necessary in all true-dual setups. It would help in some set-ups, and not in others.
Not heard that before and it does controdict what I've read in the past, but hay maybe I've missed something.

Would you mind expanding on 'what' setups [u]do[/]u and don't benefit from a mid pipe and explaining what the differences are between them, cheers
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