Dynatech Longtube Headers options for 07-10 and 11-12 GT500

[Justin@VMP]

The Dynatech 1 7/8" LTs phsyically bolt up to all 07-12 GT500s because they use the same motor/chassis, but there are some minor differences on 2011+.

The 2011+ GT500 uses a new 2.75" exhaust and switches to an H pipe instead of the X found on 07-10.

They also use wideband front O2 sensors with a different connector.

On 07-10 we traditionally use the Dynatech LTs and 2.5" or 3" x-pipe (retails for $1199).
http://www.vmptuning.com/store/index...356&parent=108
http://www.vmptuning.com/store/index...411&parent=108

If we use the 2.5" x pipe its much smaller than the stock catback, if we use the 3" x pipe its larger and requires the catback be cut down and adapted, which I prefer not to do.

I had a 2011 in the shop last week for TVS and LT install, and this is what I did:


The Dynatech LTs were installed and the 2.75" powercat converters bolted up. Then I cut the the stock H pipe, I believe it needs to be around 22-23" long, measure your individual car first.. The H pipe can be clamped or welded into the cats. Depending on how everything goes together, the H may need to be cut a little bit so the tubes can spread open 1/2" where they go into the cats, this can be done by cutting the back side of the H which allows the tubes that go into the cat to spread out a little, and then welding the H back up. If you weld onto the cats, you may want to bolt everything up a little loose, tack in position, drop it down to weld, and then bolt it back up tight.

Doing it this way allows you to keep the stock H (some prefer it for sound vs an X) and it is actually a little cheaper too, ($1050 total with cats, or $758 without cats):

http://www.vmptuning.com/store/index...356&parent=108

http://www.vmptuning.com/store/index...418&parent=108
or
http://www.vmptuning.com/store/index...419&parent=108

I also sell the parts to do this on 07-10 too, you can buy 2.5" collector adapters or cats and mate them up to your stock 07-10 stamped X pipe (or H pipe on KRs):
http://www.vmptuning.com/store/index...389&parent=108
http://www.vmptuning.com/store/index...423&parent=108
This reduces the cost to $758 no cats or $1048 with cats for LTs on an 07-09.

I will say that my 07 with LTs, 3" X-pipe/cats, and stock mufflers sounded pretty good. If I did it with 2.5" x pipe it would probably be a little quieter with no loss in HP for a sub 800rwhp car. I probably not not be afraid to run LTs/no cats/stock mufflers from a noise perspective on an 07-09 with 2.5" exhaust..

On the 11 with LTs and cats, it is a tad on the loud side (for me), which some may like, but not unbearable IMO. I think the factory exhaust is a little louder with its H pipe and 2.75" muffler, so the LT/cat setup is louder.

For anyone with a 2011-2012 that purchases these, I can include the correct style O2 extension for the new factory widebands.

[dbarbarine]

In your experience, if someone does these modification/enhancements to an 2011-2012, is there a tune change required because the upstream O2s are in a different location?

[Justin@VMP]

On 11+ with factory widebands, no.