This is a general question, and I'll admit I haven't done much reading or research into the suspension department...but I would appreciate a start in the right direction.

I want to put SFC's on my 5speed dual cat car at this time. My goals for this car are to go all the way (Headers, different motor eventually, turbo, suspension) with the hopes of having a fine car that does well in 1/4 times and pulls high G numbers at the track (1G or better if possible). Money is not an issue (I will take whatever time necessary to get it right and spend the money when necessary). I figure the 1st mod for this car is the SFCs. Which ones will fit on my car with the dual catalytic converters (I wish to retain them)??? What other mods MUST I DO at the same time as the SFCs in order to achieve my goals???
I hear Spohn and Kenny Browns are good. Don't know if they work for my car...and I would assume whatever parts are necessary to achieve traction and stability must work together with the proper SFCs (In other words I don't want mismatched parts).

Thanks for any replies.

Are you doing the installation yourself? If not, get a recommendation from a mechanic that you trust.

I've got a Spohn setup (see sig), which makes a modified SFC designed for dual cats. The only problem was getting clearance between the crossmember and cat converter, which was done with a bit of grinding and welding.

I'm sure anyone here will tell you, if money is no option then go all out. The SFC's will definitely keep the car body stiff. But your next move should be for traction (LCA's, relocation brackets, panhard rod). With the stock diff and rear suspension I would break the tires loose pretty easily. With my current setup the car hooks GOOD. Your best bet is to get all this stuff put on at once and be done with it.

My father and I will weld the sub frame connectors on ourselves...
I do not have enough money to do everything all at once...I just want to buy the best and proven parts available...however long that takes. I am leaning towards Spohn right now...

Once the SFCs are on, would that make it more difficult to put on Headers (SLP 1 3/4")? DO I need to put those on at the same time or can they wait? Anything else I need to consider at the same time as the SFCs?

What are the differences between different SFCs???
I believe some are just longer than others...connect at different locations? Is one better than the other for different applications (drag vs autocross)?

I don't think it would be any more difficult to put on an aftermarket Y-pipe like SLP after you put on the SFC's. Like I said, just make sure you get the SFC's designed for dual cats.

Installation is pretty much the same as standard SFC's. My problem was getting the crossmember to clear a 3" cat, but you should be just fine if you use the stock sized duals.

The Spohn SFC's are sloped on the pass side in order to get the clearance around the Y-pipe.

I've never seen standard SFC's, but I assume they are box framed all around.