Its a Dynomax VT 3 inch in/out. From what i have researched, NA V6, there are slight gains over straight through in the low end(4 hp), slight losses in the mid range(3-4hp), and the same hp up top. These tests were compared to a straight through exhaust.

i would imagine that it would hurt spool, but am interested to know by how much. Has anybody made a comparison of this muffler with the valve always open vs the way it is intended to be used?

Not a whole lot out there from what i've read.

 

That muffler won't effect your spool. I don't mufflers have anything to do with spool

 

Chambered vs straight through. 2 inch in/out vs 3 inch

different designs and sizes will effect the performance.

 

I think he means will that muffler design increase back pressure. Look at patent pending valve technology (aka plate on a spring). I would imagine it would impede flow at least some.

 

Not enough to make a difference at this point. If it does, its rather minimal to where even a slight bit of increased boost pressure will eliminate any drawbacks.

I hate it when people start using NA thinking with Boost. Run it, turn it up and Go. 2-3hp that you never feel make little difference in the grand scheme of things. My goodness.

 

I'm more concerned with spool up and torque curve rather than max power. Yes one could increase boost, but that won’t help until you reach peak boost. I am simply wondering if this will push my torque curve slightly right, due its more restrictiveness in the low end.

I guess the only way to know is to try it out. Hopefully i will have a definitive answer in the next several weeks.

 

Again, at the end like that, the rest of the exhaust handles your "spool up" issues, as well as the efficiency of your turbocharger for a given boost pressure.

Will it push it slightly "right" on the dyno, possibly. But for 90% of the use most that want these kind of mufflers are designed for, you won't be in that range to make a difference anyway. Even the OEM Mercedes and supra mufflers do the same job with no ill effects.

Go for the design of the sound that you're looking for. You're 3" in and 3" out, so you're fine. Enjoy and don't overthink..

 

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