seanmcr6

weird.

I've got no low end lag on my C4S. Stock headers/mufflers with Fabspeed 200Cel cats.

Maybe there is a problem with your cats? Like a defect or something?

****ty, hope you get it sorted out!

dotframe

Any updates on this topic? I was really excited about these to go with my PSE but now I'm scared to try them out.

Chris996

P0430 bank 2: three times.
Sending CATS back to FabSpeed.

dotframe

Guess I'll hold off for now. I think my money would be better saved for GT3 seats and harnesses anyway.

garrett376

My 200cell cats recently purchased do have a smaller diameter than the stock cats as well. I had to remake my muffler bypass pipes to fit and when running the mufflers I have to really crunch down the muffler-to-cat clamping sleeve on the cat side. Even when clamped super hard, it still leaks slightly on one side, enough to feel with my hand and enough to see with the water that spits out when the engine is cold. No hesitation or running issues at all: they work perfectly other than the leaking exhaust due to the smaller tube diameter compared to the stock tube size.

Chris996

This is what I am getting with new clamps. I don't think this is right.

philooo

Wouldn't the different muffler size be explained by the different engine 3.4 and 3.6 ?

I remember buying some exhaust tips and because of a mistake I got a set of 3.4 one and they would not fit like the 3.6, they were too small as well.

That would explain it all.

garrett376

No, the exhaust pipe diameter of the factory cats is the same for an early or later 996, and the same for x51 or not...

serickson

For small leaks at the joints it was recommended to use an exhaust sealant. Not sure which one for your application but permatex makes many types.

oojkoo

+2

I'm actually thinking of purchasing the Fabspeed cats and Flash ECU. I current have there Exhaust, Headers, Tips, and Cold Air Intake but is not yet on the car.

John@Fabspeed

Hey Guys, I hope everyone had a great new year. The car should never experience any lag when adding sport cats, so you may just need to reset the battery after installation which helps resolve any problems. After proper break in, the car should adapt and feel stronger throughout the RPM's. oojkoom and dotframe, PM Sent.
thanks,

Gibbo

Hi there

I did a cat less x-pipe on my 997.1 C2S, did battery reset, even tried a softtronic tune but nothing solved the low down hesitation and massive loss of low down power/torque. It's a bad modification, simply don't do it.

pmkazz

Right on----Thank you..

Chris@Fabspeed

Curious if any of the cars that are experiencing this hesitation have a wideband O2 system installed on the car?

chsu74

I believe everyone's frustration is that this is advertised as a plug and play system when it is not.