Nizer

Look at the size of that stock collector….

karimgt3

Is there any sound video of the "headers only" car?

Karim

rm21

The gains are impressive but I swore I would never do high flow euro style cats again after my last experience (with a different vendors product). The high flow cats will wear out after extended track use. On my Cayman, they failed after 18 track days. Although no company will warranty aftermarket catalytic converters if used on a track, manufacterers must warranty their OEM catalytic converters for 8 years, at least in the US, per federal law (see http://www.epa.gov/obd/pubs/420f09048.pdf). I've never had a problem with OEM cats, and plan to stay stock on my GT3, given the hassle and costs of replacing failed cats, even if a vendor like GMG will swap them at cost. Others may think the HP gains are worth it.

karimgt3

Are the 991RS stock headers same as the 991GT3's?

Sloopy

My only reason for not going to the headers and cats would be for warranty reasons. If I could be assured that my dealer would cover it I would most likely go headers and rear center section. PS not the exhaust, the engine and tyranny.

gmgracing

karimgt3

Amazing product!!

The only thing u still need is a before/after dyno graph with the headers on!

gmgracing

From Page 1




Due to due to the traction control and very sensitive driver stability aids, the has to be in a AWD mode so the numbers appear to be slightly lower.[/QUOTE]