Well, I just ordered the racing beat midpipe and I'm wondering which gaskets I need exactly. I will be using the midpipe with the factory catback. Would this kit be what I need?

http://raceroots.com/index.php/produ...asket-set.html

 

I have those gaskets on my MazSport midpipe and they work fine.
I keep the OEM gaskets on my cat since I still need to swap out for e-check.

 

Awesome, thanks.

 

If you ordered new, it will come with the front (header to midpipe) gasket. RB instructions says to reuse the donut gasket off the stock cat.

 

I just installed mazsport midpipe on mine with stock catback and stock donut is to small..where can I get 3" donut or should I use different gasket?

 

Like I mentioned in that post you replied to... I use the gaskets from RR, which is the same thing that actually came with the MazSport midpipe when purchased new.
Then I keep the OEM gaskets with my catalytic converter for e-check.

 

They want $45 plus shipp for those two gaskets..

ended up ordering these from local exhaust specialist:
http://motors.shop.ebay.com/i.html?_...506.m270.l1313

now I need to source some aluminum blocks to make proper spacers for crossmebers..how did you make yours? any pics?

 

I kept the cross-members off... been that way for several years.
I don't autocross/track my car, so I'm not going to induce much body twisting during everyday driving.
Couple thick stocks of aluminum would be much better than a stack of washers... I always laughed at that concept.

 

If you really want to go this route and don't have the supply/tools to DIY, write down the dimensions (length, width, and thickness) for the size block you want and take it to a metal/fabrication shop.
You'll also have to note where the bolts are going to be inserted so they can drill the holes out for you.

Now my opinion (take it or leave it) is that doing this isn't worth the hassle.
Lets just say I have the ability, supply, and tools to make my own blocks... but didn't do it...
Think of this too... my MazSport mid-pipe bottoms-out while going over some speed bumps.
Now imaged what would happen if I hit those same speed bumps with some blocks installed that hung lower than my mid-pipe.
I just want you to think real hard before jumping into this.