I'm admittedly very unversed on the technical bits of this subject, and there's very little information available on this forum in regard to people that have done anything much past the RP supercat. I don't plan on doing one of these this season, but would like to educate myself.

Looking on SCCAfourms.com there’s also some discrepancy about the rules and pipe diameters? that I could use a one-two sentence summary on.

Sipe is the only guy I know of with an aftermarket welded in version, and to figure out what he's using you need a Rosetta stone or you need to sleep with him, I want to be as fast as possible, but I think I’ll pass on that, dknv if you two ever squabble letting everyone know his secrets would benefit the community as a whole:hahano:.

Anyway, my questions:
1) Manufactures, couldn't find much info on this; who makes em? low to high end?
2) Why are the more expensive one considered so much better, i.e. what/how are they doing inside the honeycomb and why does it work so well?
3) Is the SCCA rule pretty much the pipe diameter before and after the cat have to be same as OE, whats the discrepancy?
4) How does it matter where the Cat is positioned, is there a rule on this as well?

pm me for some of you answers.

beers :beer:

Why dont use just post so all can read? That is the point of a forum.

Why dont use just post so all can read? That is the point of a forum.
it's competition racing, everyone doesn't want everyone else knowing what they're running. Unless you're going to compete pro the exact info on this matter will not effect anyone cuz nobody's gonna spend the money.

bump for the SCCA rulebook discrepancy clarification

WTF are you talking about?

6. High flow catalytic converters are allowed, but must attach
within six inches of the original unit. Multiple catalytic converters
may be replaced by a single unit. The inlet of the single replacement
converter may be located no further downstream than 6"
along the piping flow path from the original exit of the final OE
converter.

Whatever the hell was the result of all this discussion:
http://sccaforums.com/forums/thread/78081.aspx

Does the pipe before and after the cat have to be OE sized? If so is that 2.5?

that discussion is 3 yrs old, classic AH tactic to imply something he doesn't want to see done as being illegal, when in fact it's not

all you have to worry about is making sure your cat inlet is within 6" of where the OE inlet is located, that's all. There's no restriction on sizing etc.

Gotcha thanks for clearing up the confusion, you installed a muffler near the OE location after the cat you think thats really necessary if I'll have the JIC catback instead of a single/side out? Keep in mind I've expressed to you I don't wanna be "that guy".

it's a resonator more than a muffler in the OE position, it depends on what you can tolerate for driving on the street

I have a used one that I'll be selling soon; 3" pipe by 17" body, stainless scrub packing

Get to the fabrication of a highflow cat pipe!!

Let me know when you're selling perhaps i'll start gathering parts now rather than spending it all in one lump sum.