datax

Have you guys ever touch the side of the rear bumper after hard drivings? It's hot! Probably because exhaust is stuck right there. I guess porshce also learned that and put those huge vents on 997 GT3s.

Anyway, after my car keep exploding the coolent hoses, I've been thinking of putting as much ventilation as possible to wherever that generate excessive heat. It got me started thinking of putting rear bumpers off from 996 turbo or C4S. But, some say won't fit because those cars are wide bodies and mine isn't. Then, I found this guy's picture. Do you guys know how did he make it fit?



If I've no luck with C4S bumper, I'm thinking of putting some vents like these folks. Any idea how hard/easy to get it done? Or, shall I be even be bother? Any inputs appreciated. I'm doing redline time attack end of next month and really worry that car might give up on me again.

Mr. C4

The Turbo bumper fits but not 100% and the cut outs for the myffler tips have to be changed. Some guys over on the 996 board have done it. There is also aftermarket bumpers with Turbo look that fits the narrow body.

DanH

Alledgedly some Germans are fitting the 997 bumper to the 996. Maybe for this reason. I did look for cars with this at the ring the other week but didn't see any.

Mr. C4

Fellow Rennlister "DonW-Cape Cod" has put a Turbo bumper on his 996 Cab.

NJ-GT

Just put the FabSpeed Muffler bypass pipes. They decrease engine compartment temperature by 40 degrees (my own test). I had an incident 2 years ago melting my coolant expansion tank, and lubricating the surface at Lime Rock Park.

LVDell

+1......Fabspeed bypass is the way to go!!!!

Holger B

+2...bypass pipes

ltcjmramos

I'm as loud as I want to be on the street with my Cargraphics mufflers. How big a job is it to swap out the bypass pipes for a track event?

datax

Straight pipes are so loud! I heard they make the car vibrates too. My car is not 100% track car at this point. More like a weekend warrior so can't afford to get into trouble because of the sound. But, making the engine compartment 40 degree cooler is pretty big.

Sell me your Cargraphics because I love their sound but cannot afford to buy brand new.

ltcjmramos

Keep an eye on ebay. I bought these from EBS Racing there.

NJ-GT

By the way, my rear bumper is melted on the same spot where the 996TT vents are located.

This problem happens to the 996 GT3 only. I have checked the engine compartment temperatures after a track session against a 996TT and a 996 Carrera. The GT3 gets scary hot, but the dashboard gauge reads normal.

LVDell

Whatta ya mean get in trouble? I run my pipes on the street all the times. The look on the face of the rice rocket kids is priceless!

Holger B

Same here. And I live in the city, where it echos off the buildings and can set off parked car alarms just by driving by.

When you need to keep the volume down, low rpm will do that. The exception being cold start up, but that doesn't last long (~20 seconds).

At the track (those that don't measure sound), the experience is second to none.

ltcjmramos

So, how big a job is it to swap out the bypass pipes for each track event? I do not want to run them on the street. I've heard them; much too loud for me.

Also, not that I'm a good enough driver, but any thoughts how this sort of mod, the cut-outs, might affect the car's aeros?

Jim H.

Swapping out the mufflers is about 15-20 minutes per side if you take your time and be careful not to scrape any paint. Installing the bypass pipes takes 3-5 minutes.

1. jack car up from center rear location and remove wheels.

2. Remove three nuts at the muffler bracket.

3. Loosen the the clamp after the cat on the crossover pipe.

4. Carefully drop down and remove muffler assembly forward through wheel well opening.

5. Slip on and tighten bypass pipes (I angle mine down about 15 degree to keep away from the paint).

6. Replace in reverse order BUT only use the two easily accessible nuts on reassembly and leave off the third (lower) nut if you plan on swapping regularly.

I do it all the time. First time took awhile but now it is a quick operation.