I thought all greddy catbacks for our cars were 60mm. That’s what the piping on my sp2 is. I just measured it to make sure. Are you sure the piping wasn’t replaced at some point?
I thought all were 60mm too. I measure right out the exhaust inlet. The only part that has been modified was the original resonator. The rest of the piping is still the original fro the greddy catback.
It looks like this one is 50mm. Something is off but for sure my Rs*r catback is 60mm and it does look bigger than the greddy. Im starting to think this greddy catback could possibly be for an EF 88-91 chassis
What is the outside diameter of the piping? That’s what measures 60 mm on mine. I guess the older ones could possibly have had smaller piping but that seems strange. I know the old hks exhausts had smaller piping but I have never heard of 2" piping on any greddy system for our cars.
Yeah, I thought they were 60mm too. But maybe it’s an older model or something? Maybe for a different car? EF?
ill take some measurements on the outside of the diameter once I get home. Its strange to me that anyone company would even make a 2inch piping for our cars. That’s a very small difference from our stock exhaust.
im thinking its probably for a EF. will double check this weekend once I try to test fit the catback system
HKS Sport was only 50mm IIRC (or at least something SMALL like that).
really? Then maybe this is a very old early production greddy catback and it was offer with a 50mm piping. I know it is a US spec greddy since its on the tag.
Yeah, back in the day they didn’t see a benefit to larger exhausts. Not sure if it is just the tuning software available now or what but now everyone says bigger is better. 10-20yrs ago everyone thought that bigger would be too much lost back pressure. Could be that we are now building a lot higher hp engines too. Who knows.
This 
for me because I wont be able to use it. I had plan on replacing the whole piping to 2.5 and simply use the exhaust section. After inspecting the actual muffler I came to the conclusion that it will be too much work and the greddy exhaust was probably not going to sound the same. I would need to replace the intle and outer wall for a bigger piping to go thru. I rather go with a magnaflow and have the whole piping tig weld if it requires that much work.
I’m trying to figure out what to do with my exhaust too. I have an RS*R but I want to get rid of it in favor of something 2.5" and lighter weight - although I still need it to be fairly quite (I’d like to pass sound at Laguna Seca). I keep waffling on what to do, even considering having it exit on the other side of the bumper (like the EG/DC) in order to save weight.
Have you seen the mandrel bent kits from Kteller and VSR?
Im having the same issue. Im sort of happy with my rs*s catback but it is only a 2.25 and the piping is already going out. Has a bunch of scrapes on the bottom and a few cracks that have been repair. Im guessing our only alternative is to go with a full costume exhaust. I personally have never bought any “kits” so I cant give any feedback one the two that you mention. I usually just go and buy the pre bends and straight pipes, take them to my muffler shop with my muffler and have them weld everything. Ive also been tempted to do the eg/dc exhaust exit, but I know I wouldn’t be happy with the exhaust cut on the driver side. I need to wake up on the wrong side of the bed one of these days and patch, seal the bumper exit hole and paint it. Then Ill go with the eg/dc exit and keep it hidden from sight.
I’ve heard good things about both KTeller and VRS, even that the later may be the supplier for the former. My main issue is deciding what muffler and resonator to run. If I have mine exit on the right side I was thinking of cutting out the whole middle section of the bumper between the stock cutout and where the stock cutout would be if it was mirrored to the other side. Sort of how a lot of the other track guys cut their bumpers - but not nearly that extreme, just ~2" up from the bottom, or however high the stock cut out is. I hadn’t even thought about covering up the other side. If you could do what you did to that lip you modified then I’m sure you could make it work. I like that idea a lot, I just know it’d take me forever to get even decent since I’ve never done anything like that.
The kteller looks very nice. If I can find a nice long muffler to fit in the stock location it will be great. as for resonator I can go with magnaflow.
If I go with the rightside exit I will probably run a magnaflow resonator and a straight inline muffler. If you were to go that route, will you be placing the muffler like the eg/dc style? it will have to be a very small muffler since the space is kind of tight down there. Maybe not that much since the piping will be going straight in line and not making a 90 degree bend if it was on the left side.
Yes covering the whole is not a problem. I can do it, but the problem will be matching the paint on my car. This color is really difficult to match and im really picky with those sort of details.
If you decide on blocking the whole I can give you a hand. I had also thought about the cut bumper to give it a different look. In my case I don’t think it will go with the way my car looks (stockish), but on a track car im sure it will be good.
ps: thanks a lot on bringing back an old idea I had. Now im gona have the itch to block the bumper hole since I cant find a nice catback. :bang:
I’ve been thinking about picking up a spare bumper if I can find one for cheap locally, that way I could try to cut it and see what it looked like. I randomly came across another DA that had done this exact thing. I don’t think it looks fantastic, but for me function>form, and I don’t completely dislike how it looks. Plus this is a 90-91 bumper and mine is a 92-93, and I wouldn’t make sharp angles, I’d round them to be the same contour as the left side of the stock cutout. Now that I’m learning to paint a little I’m less scared to try something like this since I’d be able to color match it even if it wasn’t perfect. Because Racecar.
The thing that would bug me about making a new cutout and blocking out the other is that the new cutout wouldn’t have the same “return” forward like the stock one, it would just be a cut out piece and you’d see the thickness of the bumper.
Pat also had his muffler on that side. He just the the muffler melt its own cut out 
http://www.modified.com/features/0710_sccp_1991_acura_integra_rs/photo_11.html
You can still have the curve edge even if you cut the bumper. It will require more body work but it can be done. Simply cut the bottom portion and move it up to its new location. Plastic weld,fiberglass, Etc.
I like both ways. The cut will be functional at the track and looks more tough. The block off hole will give it a smooth finish on the rear. Specially with my 92 bumper that has a small “lip” shape.
That’s the only bad thing about not having a hole for the muffler. Unless I make he tip of the exhaust curve down. I would have to see if it won’t be a restriction on the the down. I can also go with an inline (resonator) style muffler to be under the rear seats before it goes over the rear lca.
This? (Sorry for bad quality )
Dang, I didn’t know it has a smaller piping! I’m also leaning towards the idea of it being for an EF. That would probably explain why the resonator was replaced - to extend the mid piping. And the tip was extended too.
i just skimmed through this whole thread. lots of great work by you omg… the art you do with the valve covers is insane. that red one with the gold lettering is my favorite of the ones you posted and i hate the color red. amazing work with that front lip too. what did you end up doing with the one you took off? what would it cost to get you to do my valve cover? i have that “replica” mugen one on my car now only because my oem cover looks like complete ass. i wouldnt want anything fancy, just a repaint with polished letters.