Exhaust recommendations for NCs?
Posted: Tue Aug 19, 2008 5:49 pm
I wouldn't mind a cat-back system to enhance sound quality which is a bit average to say the least. What are people running in their NC's?
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gwrmx5 wrote:Good-Win-Racing Roadster Sport duals.. You can't beat them..
With Good Win's cat back and Aem CAI I picked up 15kw and an awesome note.
I think mx5 mania sell them -$990.
On a dyno dynamics unit we were stock 130 to 132hp at the wheels across several runs
LOWEST line is our best NC dyno run with AEM intake and our RoadsterSport DUALs, a nice gain of about 14-16 horsepower over stock NC.
MIDDLE run adds the midpipe change. This midpipe change was VERY interesting. Did several runs and they all look like this with a very slight loss of 2 peak horsepower but a gain of 5 to 8 Ft/lbs of torque from 3500 all the way past 6000 rpms. This is still a prototype unit but production hopefully by Christmas...
HIGHEST RUN adds in the header. NICE…158.9 hp and 137 Ft/Lbs!! This is the Spec Miata Race Header with our midpipe and exhaust and the AEM intake. Note that the race header does NOT have hookups for O2 sensors. You must splice and extend the O2 sensor wires. However, our midpipe includes TWO O2 sensor bungs, one before and after the catalytic converter to make it easy to relocate the sensors so you avoid a code. Nice BIG gain from the header but since the header is a pretty difficult install (getting factory header/cat combo removed is tough), I expect that most folks will be happy to get the gains of the RS muffler + AEM intake + midpipe and leave the factory header alone.
