ToniWonKanobi

Yeah, I purposefully stayed away from Fabspeed's Cup-style airbox due to plenty of Rennlisters talking about poor filament. I'd be interested to know if there's a fix for this.

cobalt

I have a fabspeed cup air box with LWF, Dansk 100 cell cat, stock headers, and an inexpensive magnaflow muffler with swans neck and dansk 4" tip. The car was tuned by Protosport using their custom made chip.

I do have a slight gap in mine as well that Jason has mentioned although it takes time and effort to seat it properly. I use my borescope to check all around when fitting it as I noticed it can be a problem. The slight gap in the front is the worst and IMO it seems to seat well enough. The K&N filter seems to sit better than the factory filters. I have never noticed any dust inside the box itself but will keep a closer eye on it. It has been on the car for >20k miles and no issues yet.

To me it is one of the better sounding 964's I have heard still sounds better than my boxster GTS with sport exhaust in sport plus mode which has a great exhaust note. It is loud outside and just the right tone inside. Quiet enough at half throttle but will shake windows under WOT especially near RPM and while shifting. the sound unfortunately eggs you on to drive faster. Best part is how free revving and strong the engine feels with this setup.

Mustang dyno tests show 248 rwhp and it moves for a C2. Don't have any clips for sound but here are the pics. All in very inexpensive for the gain in performance but is more race car'ish than some might like.

If I removed the cup box and 4" tip the car quiets down quite a bit and if I use the G pipe vs the swans neck it will increase sound a bit at WOT.

ALLPRO

Using, curve, secondary by-pass (g.pype) is it possible to use the original terminal? (Element number 10 of the scheme) or is it too far out of the rear bumper?

very thanks

HalV

Yes, you may reuse the end pipe (item 10).

Derek911

I'm in the process of going dual. I'm already running the fabspeed exhaust single out, so I'm adding the left exhaust pipe. I have the FVD left bumper with the exhaust cut out, which as others have stated in other threads come with no holes drilled so it must be fitted and drilled prior to paint. Once the fit is right, take it off again for paint. Also, the heat shield needs to be taken off the old bumper and placed on the new FVD bumper.

hillsdonsmith

Hi all,

From this thread, I think I will...
- retain primary muffler
- replace secondary muffler w G pipe
- Car currently running Cat delete - stinks badly, so will add sport cat.

Are 100 or 200 cell cats recommended and why?
- my understanding is 100 cell is better for higher performance motor/race/turbo cars but my car is entirely stock 1990 964 C2 and so am leaning toward extra scrubbing power of 200 cell.

Thanks for any experiences!

Cheers,

Mark

melman911

Hey Mark

I went with the Fabspeed 200 cell sport cat. I have a MSDS cone type airbox and Steve Wong chip as the only other mods. The weight difference between with stock cat and the sport cat is incredible. Huge difference. Power wise (butt dyno) the car feel like it revs faster above 4.5k rpms. Honestly below that I think I lost a little bit but not much. Overall the car feels more responsive. Deciding now on either primary or secondary delete. Here a pic.

hillsdonsmith

Thanks Mel!
Yes, I am ordering 200 cell cat from FVD that we will weld into existing cat bypass pipe.

Looks like you still have both mufflers. Maybe time to dump that secondary and put in a G pipe

I also have Wong chip - I was skeptical but it certainly seems to have helped mid range punch.

Cheers,

Mark