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Old 02-19-2011, 1:20am   #17
DropTopGal
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Update: Installation done. Night to day difference. Quick review:

LG longtube headers with high flow cats and 3" connector: makes the NPP sound really scary when open like a race car, when closed, a bit more sporty rumble.

160' thermostat: temps always now in the 180s.

Tune (engine and A6): transformed the car into very smooth ride around town, but when getting on the gas, the shifts are very fast, crisp, with no delay.

Our GS so badly wants to be driven hard, what it was designed to do. Another observation, gas mileage seems to have improved some, particularly on the highway.

Stock Mustang dyno: 382hp / 372tq
After headers and tune: 415hp / 409tq

The tuner said that the Mustang dyno is about 10% conservative, so real power is actually higher.


The Goodyear EMT run-flats where worn down pretty bad with 11,000 miles on them. Dry traction was still ok, but in the rain, scary driving. After considering the options, we initially wanted to install over-sized Nitto INVO tires. Unfortunately, the INVOs are on backorder for several months. So the performance shop set us up with NITTO NT05 for the same price as the INVOs. Oh, they also lowered the Vette about an inch. I think the tire sizes are (295/35/18 and 335/30/19). Many of the C6 Z06 Vettes down here have these tires and find them to be exceptional. Of course, we had a laser alignment done. It drives like it is on rails. Amazing!!

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