Anyone ever install Cats on their OBX headers?

[Gunny]

If the OBX collectors are 3" I think you will be more pleased with 3" bullet cats. The shorter the cats, the better and you still may need to shorten the cat on the muffler side when you reduce to the 2-1/2" of the Corsas.

The best setup that I used was to slip joint the cats to the headers and then v-clamp the other end of the cats to the reducer. Very quick & easy to drop the entire exhaust system when needed.

A setup that I was interested in (but never tried) is on Phil's Z ... he used braided stainless connectors to the exhaust pipes. Here's the LINK plus some good pics of the install.

[Johnny5]

The OBX headers are designed to bolt up to the factory exhaust or Corsa like I Have. SO what my #1 QUESTION is how are the cats installed on OBX Headers than connected to the cat back??????

Do you have to cut out the fake cats? than weld in aftermarket cats, than weld on the 3 bolt flange for driver side and slip on for passenger side?

[KILLSHOTS]

Originally Posted by Johnny5

The OBX headers are designed to bolt up to the factory exhaust or Corsa like I Have. SO what my #1 QUESTION is how are the cats installed on OBX Headers than connected to the cat back??????

Do you have to cut out the fake cats? than weld in aftermarket cats, than weld on the 3 bolt flange for driver side and slip on for passenger side?

The "fake cats" on the OBX headers are separate pieces. Just leave them off.

[Johnny5]

Originally Posted by KILLSHOTS

The "fake cats" on the OBX headers are separate pieces. Just leave them off.

Really? I never saw a pair in person. So I can just buy the OBX, buy (2) 3 inch inlet/outlet universal cats, have a shop fabricate them so one side comes to 2.5 inch to my corsa and I should be good?

I was under the impression that the OBX Bolts right up to the stock system so the cats that i buy would have to be the same size as the "fake ones" I won't be using correct? (to not throw off any alignment issues of my current cat back.) Does anyone know that length?

Sorry for all the questions but I wanted to do research if i would be saving $$$$ buying OBX and putting my own cats on as opposed to buying SW with cats for $1220.

[KILLSHOTS]

Originally Posted by Johnny5

Really? I never saw a pair in person. So I can just buy the OBX, buy (2) 3 inch inlet/outlet universal cats, have a shop fabricate them so one side comes to 2.5 inch to my corsa and I should be good?

I was under the impression that the OBX Bolts right up to the stock system so the cats that i buy would have to be the same size as the "fake ones" I won't be using correct? (to not throw off any alignment issues of my current cat back.) Does anyone know that length?

Sorry for all the questions but I wanted to do research if i would be saving $$$$ buying OBX and putting my own cats on as opposed to buying SW with cats for $1220.

Yes, mine bolted right up to the Corsa system using the supplied bullets. There will be no difference in system sound with different brands of headers. I really wanted SW headers and was willing to pay more for them, but not nearly twice as much. I would suggest having them coated prior to install. Good luck.

[Johnny5]

AAAH someone told me OBX came with fake cats so i assumed they were welded on and the ebay pic makes it look like its all 1 piece. Thanks guys!!

[Paul Workman]

Originally Posted by Johnny5

AAAH someone told me OBX came with fake cats so i assumed they were welded on and the ebay pic makes it look like its all 1 piece. Thanks guys!!

Suggest you use some of the saved $$$ to have it dyno tuned, asap.

You can have Marc Haibeck or Corry Henderson provide a pre-programmed chip that will get you in the ball park, and you can drive (read: HAMMER!) it immediately. Also, Marc programmed my fans to both come on at ~205º and turn off at ~ 200º, as well as adding anti-backfire fueling.

However, dynamic tuning, i.e., on a dynojet or whatever, is the best way to get the last few ponies out of your mods.