twin screw exhaust question

[mikepage0007]

i am looking into adding a twin screw or waiting to see what edelbrock comes out with over the next month, meantime i am looking to put in a cat back exhaust ..ls3 motor NO other mods are going to be done besides the sc and exhaust, going to keep a tune that will keep warranty intact-6-7 boost? if i want to hear headers and cam i will take my 67 ss 396 out....i am 99% sure i am going with magnaflow because of quality and pricing from vendors here...my question is the 16579 just is to quiet for all the work and money ....the 2 1/2" 16580 muffler delete sounds good....i have been recommended to go with the 16583 cat back 3" system , any comments ... i have scoured the threads and from what i can understand i may not be pushing enough ponies for the 3". some even say i would possibly lose hp....how does the sc and a 3" exhaust intertwine{ pros and con} ...i would of posted this in exhaust but i feel the fi thread would be more resourceful...reminds me of the debate of the 2300 and the 1900 ,lol...is bigger diameter better in my hp range? thanks everybody

[old motorhead]

If you're concerned about HP made per pound of boost, you need to be concerned about back pressure in the exhaust. Just because your exhaust is loud doesn't mean it's doing a good job. A crappy exhaust on a supercharged motor will result in more boost and less power. Simply put, if your exhaust is flowing free, you have the potential to make more power. If someone tells you that you need a certain amount of "back pressure" to make good power, they're full of BS plain and simple. If tuned correctly, a free flowing exhaust will make more power vs a restricted exhaust on a supercharged motor.

[mikepage0007]

so where would you stand on 3" with mufflers or 2 1/2 " muffler delete , i believe most backpressure is coming from the factory manifolds and cat converter...i,m not going for total noise , but noise without losing hp or as you put it "crappy exhaust on a supercharged motor will result in more boost and less power". i would like to get most out of what i want to do , add sc and cat back ..qustion is still which catback and why....thanks

[Z_Rocks]

Mike, the exhaust manifold and stock CATS were designed for NA volume and not FI. If I were you I would get headers plus high flow CATS and stay with stock mufflers to make it more quiet. You would have a better result from this combo than staying with stock manifold and putting 3" muffler. Almost 90% of the installs on this forum include LT headers.

Just my 2 cents!

[old motorhead]

Originally Posted by mikepage0007

so where would you stand on 3" with mufflers or 2 1/2 " muffler delete , i believe most backpressure is coming from the factory manifolds and cat converter...i,m not going for total noise , but noise without losing hp or as you put it "crappy exhaust on a supercharged motor will result in more boost and less power". i would like to get most out of what i want to do , add sc and cat back ..qustion is still which catback and why....thanks

Ditch the stock ex manifolds if you can. The ideal exhaust system would include LT's and a cutout in front of the muffs/cats. Short of that, 3" from the LT's back to high flow cats and good muffs behind that would be ideal. I've found Flowmasters to be loud and restrictive. Magnaflows to be not as loud and less restrictive. Camaros don't have the great option that the vettes have. Vettes have a dual mode muffler option that allows the ex gasses to go straight through(loud mode) vs routing the gasses though the muffler (quiet mode). I'm hoping someone comes up with a dual mode system for the Camaro before I have to deal with it.

[Xmicro_SS]

From what I have read, without heavy power mods, you loose too much back pressure with the 3" system. Stay with 2.5"

I put the SOLO MACH X system on my car and I have a noticeable difference in Power and throttle response and the most high end sounding smooth exhaust note I have heard to date on the Camaro. Check the thread before you spend all that money on a Magnaflow.

SOLO System Is I believe $750 to your door. Read up on them....there are tons of threads with satisfied customers......including me of course.

Here is the Video:

[old motorhead]

Originally Posted by Xmicro_SS

From what I have read, without heavy power mods, you loose too much back pressure with the 3" system. Stay with 2.5"

I put the SOLO MACH X system on my car and I have a noticeable difference in Power and throttle response and the most high end sounding smooth exhaust note I have heard to date on the Camaro. Check the thread before you spend all that money on a Magnaflow.

SOLO System Is I believe $750 to your door. Read up on them....there are tons of threads with satisfied customers......including me of course.

Here is the Video:

Wow....and if you cram a potato in your tail pipe, you could even make more power.......ahhhhhhhh shooot.

[bilydean]

Originally Posted by old motorhead

Wow....and if you cram a potato in your tail pipe, you could even make more power.......ahhhhhhhh shooot.

Sorry...but that is kinda funny.

[EDISKRAD EHT]

I'd do LT's before a catback. They'll add a nice growl to your exhaust note even with the stock catback,

[mikepage0007]

well everybody seems to agree, lt headers? ...well i don,t want to spend a fortune on a brand new exhaust, but the trash cans got to go....the headers are going to make it louder than i want , so i will stick with stock exhaust...btw all the magnaflow systems i mention , i can get on this site are in the 650 to 850 delivered from camaro5 vendors

[Crowley]

Go with ARH Long Tubes, Cats, Magnaflow 3" system. It is not overly loud at all. It is nice and mellow but says hey .. I got a bit of attitude !!

Crowley

[JANNETTYRACING]

The exhaust system is only as good as it's smallest hole, in this case the manifolds and factory cats are the smallest hole so anything you do after that will be pointless.

We have built cars with superchargers from 6 to 8 psi boost with stock and modified CAT BACK exhaust and saw no difference in performance.

All though, Headers Lower Boost and Gain 10 HP, which is a very efficient way of gaining power.

Ted.

[Mike@KB]

Originally Posted by JANNETTYRACING

The exhaust system is only as good as it's smallest hole, in this case the manifolds and factory cats are the smallest hole so anything you do after that will be pointless.

We have built cars with superchargers from 6 to 8 psi boost with stock and modified CAT BACK exhaust and saw no difference in performance.

All though, Headers Lower Boost and Gain 10 HP, which is a very efficient way of gaining power.

Ted.

That's pretty much what we see with high boost (above 15). If you are looking for every ounce of HP then headers are an option. But 10HP for $1200 or 15-20RWHP for $69 (Pulley change). Keep in mind, this isn't 1969 the O.E.M. exhaust is pretty good.

[EDISKRAD EHT]

Originally Posted by Crowley

Go with ARH Long Tubes, Cats, Magnaflow 3" system. It is not overly loud at all. It is nice and mellow but says hey .. I got a bit of attitude !!

Crowley

Yeah I have LT's (Kooks though) cats, and a Magnaflow catback on my GTO, and I'll be going the same route on the Camaro. It has a nice mellow (but deep) sound under idle and normal driving, but screams like a banshee when WOT.