titanjc

Right now I'm running SLP Loudmouth axle-backs on my 07. I love the sound, but I've been thinking about picking up a set of OBX longtube headers with the O/R h-pipe sometime this spring / summer, and I really don't want my exhaust to be any louder than it already is. I'm thinking that I'll probably just throw my stock mufflers back on the car if I go the header route, in order to tone down the sound, and also to sell the SLP's to offset the cost of the headers (poor college student).

Now I remember seeing that with the stock manifolds and cats, an axle-back won't net you any HP gains at all, but what about if you're running L/T's and an O/R pipe? Will the increase in flow be BADLY bottlenecked at the over-axle pipes and A/B's? Will it be a minor 2/3 HP choke? Or am I just being paranoid about this, and the stock mufflers flow enough for the addition of L/T's?

Keystone

The stock mufflers will flow fine. Maybe you'll notice a difference if you have forced induction, but not NA. As for the sound... I bet LTs with an OR H-pipe will be LOUD. I'm running Kooks LTs with their catted H and the factory axle backs and I think it sounds just about perfect. Considerably louder than stock but not obnoxious.

titanjc

Keystone, have you heard any other exhausts in person that you could compare the volume level to? I have only personally experienced the stock system, the Stingers, and the LM's in person. I first had the Stingers (actually Steeda axle-back, but same system), and they weren't aggressive enough IMO, so I changed them out for the LM's. I can't see the LTs with stock exhaust being louder than the LM's... the OBX system does have resonators built into the h-pipe, which would probably help as well.

wallace

How Well do Stock Mufflers Flow?? Look here an see. ( 1 2)
2k05gt
How Well do Stock Mufflers Flow?? Look here an see.
said it before...... i'll say it again KEEP THE STOCKERS !!! or at least start at mid-pipe or longtubes as you suggested. OBX is an excellent choice and yes, you will also have the h-pipe w/ resiniators. that should keep the volume in a comfortable place. check out the link.... from guys who have kept the stock muffs.

titanjc

Thanks wallace, good info in that link.