Hea Guys! I currently have 2-1/2 exhaust on my camaro. I have new 406 smallblock. It has 11:0 compression making 534 horse. I have 1-3/4 long tube headers, 400 turbo, 3000 stall, 3:73 gears. 2000 rpm 418 ft lbs, 488 at 3500, and 508 at 4000. Max 523 at 5000 rpm.
Would it be benificial for me to go with 3" exhaust?:confused:

At 534 hp i would use 3 inch. Does your 2.5 inch exhaust have an x-pipe? If not, it's probably worth the change to 3 inch with an x-pipe. If you do the change, think about getting Borla xr-1 mufflers. I did and cannot believe the power difference over the delta 40's i had before!

I would keep the 2.5" exhaust.

Install cutouts if you are concerned about leaving something on the table in the upper rpm range. You can get it HERE (http://store.summitracing.com/partdetail.asp?autofilter=1&part=SUM%2D670136&N=700+115&autoview=sku).
http://static.summitracing.com/global/images/prod/large/sum-670136.jpg

I would keep the 2.5" exhaust.

Install cutouts if you are concerned about leaving something on the table in the upper rpm range. You can get it HERE (http://store.summitracing.com/partdetail.asp?autofilter=1&part=SUM%2D670136&N=700+115&autoview=sku).



I never cared much about going to the track and messing with cutouts. I drive to the track and run it as i drive it.

It has a straight crossover pipe. Do you think it would make that much difference? I talked to a guy that put 3" on a simmilar motor, and he said 3" sounds alot better.

I think you would gain some-how much?
I will say that I gained 2 mpg going from a 2 1/2 h system to a 3" x system.
every car is differant but I would run 3" behind your mill with no doubts

3" with an X pipe. :thumbsup:

another alternative would be to put a 3" X pipe in it and keep the 2.5 after that point.

It has a straight crossover pipe. Do you think it would make that much difference? I talked to a guy that put 3" on a simmilar motor, and he said 3" sounds alot better.


I would do a 3 inch exhaust with Borla xr-1 mufflers and an x-pipe.

3” would be better
I track tested a 3” X-pipe against 2 ½” turbos recently
My 383 only makes 490hp and it picked up about 1 tenth & 1 mph.
Since you have more power I would think it would be worth at least that much.

Your right on the edge of needing 3". If I were buiding from scratch I would do a 3" Maganflow X system, but if i already had 2 1/2" I would just add a X. Your probably only leaving a few HP on the table. If it were 600HP, I would be telling a different story.

I have a similar motor, no idea how much horsepower it makes but probably around 500. I went from a full 2.5" flowmaster with an H to 3" with a DR gas X and magnaflows dumped at the axle, the sound is mellower at idle, a bit louder wide open, and I picked up .3 and almost as many MPH in the quarter mile. 11.70 to 11.40, no other changes.
So yeah, imo I guarantee you will notice a difference.
You could go cutouts too, but I like to run it like I drive it so they were not an option for me.
Your headers probably have 3" collectors (my supercomps do) so at bare minimum go 3" to an X and the mufflers (I prefer DR Gas X's) and then 2.5" from there if you want. I dumped mine at the axle as I said, and they are barely louder than my flowmasters were especially at idle or cruise.

Another question! The H pipe vs the X pipe. I have H now?

Another question! The H pipe vs the X pipe. I have H now?

I think it's pretty widely accepted the X is an improvement over an H in all cases, the debate is usually how much. I have had great luck with them and wouldn't consider anything else but an X.
Plus they really mellow out the at idle and part throttle tone, and sound killer on WOT. I love 'em, have them on two of my cars, and prefer DR. Gas over all the others as well.

I never cared much about going to the track and messing with cutouts. I drive to the track and run it as i drive it.


There's always electric cutouts... Just my .02 ...

3" with an X pipe. :thumbsup:

x2 or whatever it is up to now.

Thanks You guys! I think I will definitely get a 3" x pipe.

Let us know how it turns out, I bet you will notice an immediate seat of the pants diference.
And also, spend a few extra bucks and go with the Dr Gas X, I personally think they are a bunch nicer than any of the copies I've seen. They sell a nice kit that goes from the headers to just ahead of the mufflers, very nice stuff. I have an X from them thats 10 plus years and probably 100K miles and still looking good, well worth the cash. Dr. Gas (https://www.drgas.net/index.php)

I'm a little old school, can someone explain to me how the X-Pipe provides an advantage over a traditional split dual 3 inch system? I'm looking at a new system for my 427 this summer.

I'm a little old school, can someone explain to me how the X-Pipe provides an advantage over a traditional split dual 3 inch system? I'm looking at a new system for my 427 this summer.



sure!

INSTALLING AN (X) PIPE IN THE EXHAUST ON A DUAL EXHAUST CAR is basically done to significantly reduce the flow restriction and induce more efficient cylinder scavaging thru use of controlled negative pressure waves at the exhaust port theres a great deal more info in my data base and sub-linked info

http://forum.grumpysperformance.com/viewtopic.php?f=56&t=1503

http://forum.grumpysperformance.com/viewtopic.php?f=56&t=1303

http://forum.grumpysperformance.com/viewtopic.php?f=56&t=495

How much louder are the 3 inch over the 2.5?
When I was 18 it did not matter, 43 married now matters
Rick

3" isn't quiet by any means....however....

my 3" dumped x-pipe exhaust with one chamber mufflers is quieter in the car than my uncle's 65 Nova with 2.5" traditional duals ran out the back with no x or h pipe with regular 40 series mufflers. The X will quieten it down a good bit. He even has dynamat on his entire floor pan where I don't.

A good 2.5" system will support 535 HP no problem. The key is mandrel bends, an X pipe and good flowing mufflers (Dynomax Ultraflows or similar).

If the current 2.5" system is not mandrel bent or if it has mediocre mufflers start over and go to 3". If it is a very good flowing 2.5" system I'd leave it alone.

I ended up running 3" with an X and 40 series mufflers. Thanks Guys!