So i was wondering if i should use the gaskets already on there, replace it with a new stock one, or get an aftermarket metal one. If i get new ones anyone have part numbers for the gaskets? I need pictures if i get aftermarket one, i dont know what they look like. I got a HKS DP and coated it with JetHot2000.

Also should i get new studs/bolts?

 

I recommend staying with mazda oem. Call up Ray Crowe at Malloy Mazda at 888 533 3400, he gives rx7club discounts and usually ships free. I'd recommend getting new copper nuts as well as the gasket. You don't need part #s, ray will know what you need

 

Thanks

 

or 105 shipped i have a brand new one from ray

 

they are usually in good shape, you can reuse them but it's all in personal preference as if there is a leak it can warp your downpipe flange. there is no aftermarket manufacturers for those gaskets that i know of, i wouldn't trust many manufacturers with a gasket that sees 1800F anyways.

 

just take a torch to it and get it red hot, this is to expand it. then when you put it on and bolt up the exhaust, you are mashing it down again creating a good seal

 

^^^ lol when it cools its going to shrink... then it pretty much would be loose. nice try though

 

negative!

 

It's made of steel, not lead. Heating it to red hot is merely a massive pain in the ***. It won't make the gasket undeform to its original shape. Nor will it soften it to the point that it will crush further.

IMHO, the best policy is to change the gasket anytime you change either the downpipe or the turbos. Reusing the gasket generally works if it's the same parts. You also need to be sure that the studs/nuts, if reused, go to the same locations they were in.


What will make a gasket undeform so it can be crushed again is to use a blade to spread the layers and stretch out the center sealing ring. I've done it; it seems to help. But it doesn't solve the problem like a new gasket does.

Dave