FRPP parts feedback

As winter is setting in and my 02 GT is headed for storage, I find myself flipping through the pages of my 2004 FRPP parts catalog once again, hoping to find some reasonable goodies I can amass for installation next spring:

Anyone actually used and have any feedback on the following bits:

M-5500-A UCA kit
- bushings are twice as stiff as production for better lateral axle location; adverse effects for street car?

M-5230-M52 cat back
- sound? comparison to other catbacks?

M-5300-F springs with 460/570 170/310 rates F/R
- advertised 1.2" drop front, 1.0" drop rear; too much drop? too stiff? car sits like an F-150 now so there's room for a drop...

Car is a daily driver, not a drag racer and rarely sees the track though it does see quite a bit of WOT and on- & off-ramp charging

LI98GTStang said:

Out of your choices, I can only personally speak for the catback. Quality was better than stock, mandrel bent, no drone and improve sound quality. I didn't feel any hp increase however in the SOTP meter however and on the dyno.

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That's to be expected I guess. I wouldn't have expected much in terms of HP from the cat back but I'm addicted to the sound improvement the MRT H gave and want a cat back - sans drone - to enhance that further.

I don't see much people with the "F" springs, but the "C"s are very popular here. What are the specs there on the F springs - progressive rated or specific? Oh yeah, with a 1.5" drop, you will need caster/camber plates that will allow you to get back into alignment. Max you typically can go is a 1.25" drop in front.

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Looking at the FRPP cat page:

http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=272

I see that the 'C' springs are probably more what I'm looking for in terms of drop. They spec a 1.125" drop for the front and 3/4" on the rear which seems pretty good. 650 lbs/in though?? Wow...that'd be a very stiff ride. Like...unbearably stiff on ice-heaved roads?