Cammed v6 exhaust

[REV-231]

Got my VS tuned a few weeks ago, and my tuner suggested i upgrade my exhaust... Again...

At the moment it has Advance extractors (just like HM's) 2inch collectors, twin cats into single high flow muffler, single 3 inch out to the back. Goes and sounds sweet as.

These are the mods:

tuned Delco ecu, 1.8 YT Ultra-lite rr's, YT moly pushrods, Custom Tighe camshaft 225@ .050, Crow level III springs, moly locks and retainers, rollmaster timing chain kit, recon stock spec heads, S/C V6 CAI, K&N filter, VX injectors, Ported & modified AFM & throttlebody match ported to plenum, ported intake manifold, Walbro GSS342 fuel pump.. i thinks that all... lol. and 5 speed too

- 240rwhp (179rwkw) on 91 octane Shell

Im currently chasing some 2nd hand pacemakers. also, im looking at upgrading from twin 2 inch to twin 2- 1/4. Then back to single..... as before

Ive been stewing over it for a few weeks now..
*Is it worth it?
*Will there be any gains?
*Should i just stick with what i have?

[Classifi3d Calais]

i think you could leave it with what you have. Maybe spend the $$$ on some head work

[Not_An_Abba_Fan]

You would be losing exhaust velocity where the twins go into single. Putting bigger headers on it and running twin 2 1/4" into single 3" is definitely better. But where do you draw the line? Spending more on the heads is pointless until you get the exhaust working.

[Blown V6 Hatch]

Well, the problem is that twin 2.25" will flow more than a single 3". So the single 3" will be a restriction.....You would be much better off going twin 2.25" all the way!

[Not_An_Abba_Fan]

The exhaust will have cooled enough to take up less space. By going twin 2 1/4 into single 3 keeps the exhaust velocity up.

[Blown V6 Hatch]

Originally Posted by Not_An_Abba_Fan

You would be losing exhaust velocity where the twins go into single.

Originally Posted by Not_An_Abba_Fan

By going twin 2 1/4 into single 3 keeps the exhaust velocity up.

????

I would still go twin 2.25" all the way over a single 3".....

I have a single 3" on my L67 and if i had my time again i would not go a single 3", i would definately go with the twin system. However it would be twin 2.5" though. Having said that, i'm not about to replace a perfectly good exhaust....When it rusts out it will get replaced with twin 2.5"

[Not_An_Abba_Fan]

Quote in context why don't you.

Twin 2" into single 3" doesn't work. Twin 2 1/4" into single 3" does.

[Blown V6 Hatch]

My mistake, thats not the way i read your posts.

[Not_An_Abba_Fan]

OK, I should have clarified.

[VSIIBerlinaL67]

get difilippo headers they make the biggest for the vs

[cracker]

i find it hard to beleive that a standard vs with a cam and rockers is pulling 180rwkw.
what do they pull stock 100rwkw 80rwkw seems abit sus. id expect maybe 150rwkw

[Not_An_Abba_Fan]

You don't know much about the ecotec then do you.

[REV-231]

Originally Posted by cracker

i find it hard to beleive that a standard vs with a cam and rockers is pulling 180rwkw.
what do they pull stock 100rwkw 80rwkw seems abit sus. id expect maybe 150rwkw

i get that a lot....

made 150 without a cam

Check the 1st post... doesnt read very stock to me?