Just some background on the car and mods so far; 03 G35 6mt, stock block, stock heads, stock plugs, Osiris tuned, Stillen Intake, MD 5/16 Iso, Mrev2, complete Borla Exhaust.
We swaped out the Borla headers and exhaust with DC Sports ceramic headers and Momentum's header back exhaust kit. It instantly made more power and with a little tuning adjustment, this is what it made:
Don't ask what the 1/4 mile time was, all I'm saying is it is less than a Bakers Dozen!

 

what were the previous numbers?

dyno 1/4 seems very different from a real track but useful info all the same.

 

The last pull before the exhaust swap was 277hp / 258tq.

 

Nice Ben!! Do you have any info on the momentum exhaust is it single or dual. I probably will be down in a month or so.

What rpm were you shifting at?

 

It is the header back, dual exhaust system from Momentum. I was shifting at 6500rpm and carrying 4th until 7K through the trap.

 

If you want to make more power NA get 3" collectors. http://www.mandrel-bends.com/catalog...04ss-1990.html