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Are most people running their exhaust under or over the rear axle?

I got some used Advanced Design shocks and struts a while ago and I'm finally getting around to putting them on my second-gen RX-7. The problem is the bottom shock mount in the rear, where the shock mounts to the hub. I got new mount-bolt things from Ground Control that are supposed to replace...

Has anyone dyno'ed their RX-7 with the TWO mufflers installed that are necessary to meet a 92db sound limit? Cuz I just did. Let's compare.

I am switching to a single-exhaust and I need to make sure that the muffler that I get for it is quiet enough to keep me in the low-90s in db since that's what most of the tracks around here require. What kind of muffler are you running for quiet tracks? Anyone tried the Racing Beat Power...

Anyone got an extra Kosei K1 that they don't need and want to sell? Just need the one. thanks!

I have FINALLY sorted my car's overheating issues and I thought I would post the story for anyone who might run into this and be looking for a solution. I started with a stock radiator and stock cooling system. I also made the mistake of assuming that if the factory gauge wasn't reading high...

Can I swap to the high-pressure oil pressure valve without changing my oil pump? Please? Cuz that would be nice. '89 ITS Rx-7

So how do you get rid of that thing? What does it do? What's legal? Mine's still sitting there mocking me. "Unecessary weight!" it cries. I have a '90 ITS RX-7

Ok, since I've decided to give it up on the driver's window finally, I need to re-do my cage a bit and "gut" the door. But I want to make sure I'm legal. Yes, I've read the rulebook. The question that I have is, what does 'modify' mean in regards to the inner door support? I would take it to...

I think I messed up my car, legality-wise. I cut the crossbars out of the radiator opening of my 89 RX-7. It was running hot, so I was messing with the ducting and for some reason I decided that if you can put an air-dam on a car, then you should be able to mess with that area of the stock...

Ok, with the idea in mind that we'll be able to use threaded body coilovers next year, I've been looking at some new options for shocks n stuff. Has anyone actually raced with the Ledas, Teins, JIC, or Endless coilovers? Any comments? They sure look nice, not that that means anything. Any...

Ok, I ran my car for the first time in a year or so yesterday, and it got too hot. (It's an '89 ITS RX-7) I researched it a bunch, and I determined that what I need to do is plug the bypass in the water pump and get another oil cooler. (I already have a Mazda Comp radiator and a gutted...

So what kind of spark plugs should I use on my '89 RX-7 ITS car?

Why? that is all

So after my car is warmed up, I usually have to hold my foot to the floor to get it to start. I believe this is actually a fuel cut-off for the car. Does this mean that my injectors are leaking? Or is this common after removing the six-ports and the emissions?

------------ Come race with us in Xsanctiong_bodyX. You can run whatever size wheels you want, and you can convert to a Mass Air Sensor. Starting in 2004, all of our classes will be based on power to weight ratios. You can run a jet engine* if you want. ------------ So I see a lot of people...

I have a question about mixing of parts from various car models to make your own model utilizing the best stuff from each of the factory models. I thought that you couldn't do that. For instance, here is a post that is a good example: (Sorry for using your post here, anonymous person, but it...