pinoyremix

For those of you with the rb exhaust system does this look right? The guy that is selling it just said that it doesn't fit a 13b. I really wanna know if the exhaust end is correct where it connects to the presilencer...is it missing the flange? or is it suppose to connect to the presilencer like that?

Crit

iTrader: (6)

No, that's not a RB header. That's a handmade header with a slip-joint, made on a purchased RB header flange. The collector looks a little rough, and I've never seen a RB header without a cat flange or with a slip joint on the rear primary.

pinoyremix

thanks.

Jeff20B

iTrader: (13)

Crit is WRONG!!!

It is a real RB header that somebody modified by adding a pipe to the end and slotting the holes up front. It might be for '71-'73, which is incompatible with '74 to '85 12As unless you slot the holes. The studs were closer together on '71-'73 engines.

Throw it on an engine and take a picture of the gap between the studs and the slotted holes. I bet it will have some up and down movement if you have a '74 or later 12A.

Edit: you're going to want to cut off that crappy slip-on pipe at the end if you plan to use this header. The thinwall of the crappy pipe will sound terrible that close to the header. It will sound tiny and very cheap. Never use thinwall between the header and the first muffler.

Crit

iTrader: (6)

The slipjoint is original Racing Beat work? Sorry, but I've never seen it.

And did that really require all caps AND three !'s? I feel like I've been scolded.
*slinking away*

Rogue_Wulff

If you are reffering to the one just before the 2 pipes join, yes. My RB header has the same joint, in the same place.

Jeff20B

iTrader: (13)

Sorry about that. There has been a lot of wrong info on the forum lately. I kind of thought I'd start correcting people but I need to do it in a way that is not unsulting. That way everyone learns.

Wulff is correct. That slip joint before the pipes collect is stock. The slip joint after the collector is crappy aftermarket thinwall crush bent garbage. That;s what should be cut off and redone with thickwall Racing Beat pipe.

Oh and Crit, only a few collected 1st and 2nd gen header models have the presilencer flange. All the rest just have a 2" long pipe after the collector. As in the case of the header pictured in this thread, since I believe it to be a '71-'73 model, it would have had the 2" pipe. Infact I suspect it is inside of the slip-on pipe. It would be too much work to try to cut the weld in order to slip it off, so I suggest cutting the whole thing off and starting over, like I did on my REPU header recently.

Notice it had a similar slip on piece of thinwall?
https://www.rx7club.com/forum/showpo...3&postcount=53

I cut it off and added a new piece of 2" thickwall and proceeded from there.
https://www.rx7club.com/forum/showpo...7&postcount=72

'84-12A-GSL

Althou we've already established that it is a real RB header...I will further confirm it with a picture of my RB header

SSRx7

Speaking of 12A headers, my FB has a header that has two 2" tubes from the engine flange all the way back to the end flange. The end flange is rectangle about 3"x 6" (estimating) and the pipes bolted to it have a y pipe after the flange where they join into a single pipe. Someone added an after market cat here. I think this would be called the mid pipe. The aft end of this is flanged and bolts to the tail/muffler pipe.

Question is does anyone know what kind of header this is that I am describing?
There are no markings on it that I can tell.

Thanks
Bill