danglerb

What seems odd is how well the X works, and how long merge pipes and how to make them have been around without them being a standard factory arrangement. Do they have any down side beyond cost?

928ntslow

Not sure how happy you're going to be by refitting the rear muffler. I guess this may be a temp fix for you, but you may want to consider going with a Borla or some other sport muffler for the rear....OR, leave the RMB( because nothing replaces that kind of exhaust note) and fit a couple of sport mufflers in place of the resonators. The latter will give you the sound you are looking for I am sure.

Ed Hughes

Yep, the stock muff quited her down a little from the RMB, but it's still got "some throat" to it, if you know what I mean. I really didn't think the RMB was too awfully loud, I just didn't like the tonal quality. I'm probably going to either do your last suggestion, or look at some larger resonators with the RMB.

Jim M.

I plan some sport type mufflers also, but not until I do a 2-1/2" cat back system. As our systems stand now we have the X but it is restricted by the reduction down to less than 2-1/4" for the remainder of the system.

Jim Mayzurk
93 GTS 5-spd

SeanR

Ed, Rog should have the S4 resonators on that '87.

Ed Hughes

Actually, I'm talking to Carl Fausett about testing his new sport muffler setup.

docmirror

Rather than throwing parts, measure the voltage at LH pins 24 to 5 with the car fully warm. Get back to me. You can also check comector T48 and insure it is tight with no shorts or opens.

Doc

Ed Hughes

Thanks Doc, but I already got a new O2 sensor. For the record, it didn't trip the check engine light until it got up to about 140-150 degrees, not quite fully warm.

mpesik

well.
what'll it do now-!!!!!!!!!!!
you posted before you ran the thing ***** out?

Ed Hughes

It's in process right now, I'll know tomorrow.

mpesik

I hope there's a decent gain.
I love and hate these cars.
BUT-for the price relative to gain let's hope you can pass on something significant and worthy for the money spent.
There's a lot of competition out there.
good news-perhaps.

Imo000

Ed,

By capping the air tube, wouldn't that put too much strain on the air pump? Where will all that air go when the line is capped?

Ed Hughes

Airpump is offline (no belt), but there is still vacuum in the system. I'm pretty sure my old O2 got buggered up.

The low end on this car is definitely stronger. When I leave a stoplight or stop sign with the same heavey foot I used to have, the tires break loose a bit. It also feels like it breathes better thru the R's til redline.

docmirror

Oh well, hope the O2 does it. You must have a pretty good assometer to detect the change in accel from just an exhaust mod.

danglerb

Isn't an X pipe supposed to be about the same as a H pipe at lower rpm with the differences being at higher rpm the H stops helping much and the X doesn't?