Tofuball

Would the RB street header bolt up to the stock cat of a '90 'vert?

Or will I need to buy or fabricate something?

KNONFS

iTrader: (14)

Will need to fabricate an adapter

1987RX7guy

iTrader: (3)

Yep it is not the same length so it will not BOLT UP or ON

Dougster

Mmmmmmmm. I need a header!....
(In my best Homer Simpson's voice...)
Really, you could get a muffler shop to get it to work I am sure...

walken

iTrader: (6)

My pacesetter bolted right up to my catback, but its a s4 base. I don't know if it is different on a s5 vert.

vectorminds

i think mazdatrix sells a replacement single cat that will bolt between the stock catback and the streetable header... i dunno how much it costs, check it out

wozzoom

The header is about 4" inches short of bolting up to the stock cat.

you can make an adapter to fill the gap or get a custom cat made.

Crionics

That's why rb sells the presilencer - to fill up the rest of the space between the header and the catback.

Tofuball

I heard that the presilencer REPLACED the cat :-p

I think I'll cut the flange off the header and weld up something so it will fit. Just as long as it is too short.

Thanks for the info!

88IntegraLS

I concur. I'm planning on to welding in one of those car chemistry baffle devices in that adapter (if it fits).

avoid

Thats all?

poor college student

if you read his post, he said that the presilencer fills the space between the header and the catback.... no mention of a cat between the header and the catback

Tofuball

Can I have an exact mesurement of the adaptor so I can lenthen the header before I send it to be coated at Jet-Hot? I'm driving the car at the time and buying new gaskets for fitment is a pain

Mephis

how ya plain on getting to an exhaust shop lol?

ajsuper7

the newer style pacesetter's bolt up to the stock main cat. i know pacesetter was garbage in the past but they seem to have done some refinements, im very happy with the one i bought recently. but if i had the cash i obviously would of gotten something like the rb or mindtrain one.

Tofuball

I've got my own equipment

Tofuball

Just some follow up on this. I've since installed all the stuff and it was indeed around 4" too short. The pipe isnt 'streight' (it is actually slightly at an angle)

I decided against doing it myself. I hacked off the flanges from my old pre-cat and drove (open header! Weee! LOUD! HEADACHE!) to the exhaust shop and had them weld up an adaptor. Well, they looked at my main cat and said it was toast, so I told them just to use the flanges to make a streight pipe. So I'm waiting on UPS to get my highflow cat I ordered to my doorstep. Then I'll set up some pictures and mesurements for anyone else who wants to do this.