Considering X Pipes for 1986.5

Considering X pipes for my 1986.5. I live in PA and have antique plates for my car. This means I do not need an emissions test. Should I go with Xpipes without the cats? Or, do I get hi flow cats? Also, I have installed already the latest Porken Chip set. He had asked if I had X Pipes and I said I did not. What effect would this have no that I am considering putting the pipes on?

Any insight would be greatly appreciated.

Brian

I have antique plates in MD, and planned along similar lines.

I opted to go for high flow cats, 100 cell count, available from Mandrel Bending Specialties on ebay.

I used an Ott x-pipe that I've had for years.

And built the system back from there. Well, actually, had a shop I'm familiar with build it back from there, using 928 Motorsports/Stebro v.1 mid pipes. With OEM final muffler, it is quiet, with no final muffler it is loud...I'm still in pursuit of "just right"...

I recommend talking directly with Ken. I believe the concern is that sufficient exhaust flow and improved scavenging of gases from the cylinders can lean out the fuel mixture to a point where the additional ignition advance and leaning of A/F ratio can give rise to concerns about detonation. IIRC, he provides advice to check the CO post-install and recalibrate the MAF if need be- if too lean conditions arise, and not that he has separate programming. But again, I recommend talking with him directly in case I'm mistaken.

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Not sure about your specfic Model year but the S4, GT and GTS models breath significantly better with a Xpipe. In my experience it might have been exagerated by partially plugged cats but either way it frees up the engine to freely rev.

From a noise issue my car was too loud with the x and RMB so I went back to a stock GT rear muffler with OEM small resonators...........perfect balance between power and noise level.

I do not run cats, dont have to but I would think of adding them if doing over as the car does emit unpleasant odour.

Thanks for the insight

Malcolm wrote: Not sure about your specfic Model year but the S4, GT and GTS models breath significantly better with a Xpipe. In my experience it might have been exagerated by partially plugged cats but either way it frees up the engine to freely rev.

From a noise issue my car was too loud with the x and RMB so I went back to a stock GT rear muffler with OEM small resonators...........perfect balance between power and noise level.

I do not run cats, dont have to but I would think of adding them if doing over as the car does emit unpleasant odour.

Thats what that smell was


Just jokeing buddy, Brad

Yea, w/o a cat they don't smell great, but it is not to offensive. How often are you sitting around at the rear of your car with it running anyway???