The SCCA autocross and the Goodguys autocross aren't in the same league. That autocross pad at AMP is something like 5 acres, with absolutely nothing to hit. No parking bricks, no light poles. And the SCCA knows what they're doing. I've never been to one of their events here in PHX but there are several Nationals-level drivers that participate, so chances are, you're going to find a nice, open course with the ability to pick your own line through it rather than have the line imposed by a narrow sea of cones, and a run time of probably close to a minute if not more, just because the lot is so big and open. Most of the SCCA events are on a very small lot at the Bondurant facility, so they bust a nut when they get to run at AMP, and take advantage of it.
The Goodguys "autocrosses" are usually short, tight, sea-of-cones laid out by people who think that making them tight and filling every possible empty space with a cone makes them safer, when in fact it does just the opposite.
As for car mods, I used to like Hawks but I grew tired of them. Even the HPS needs a little heat to work its best, and dusts like crazy the whole time. Forget about HP+ for autocrossing, their braking power at autocross speeds comes from grinding the rotor away.
Also, if you're at all concerned about class competitiveness I think the SFC's bump you pretty hard. I say screw it, mod the car the way you want and have at it. If you were really concerned about class competitiveness there are about 500 better options now than a Foxbody 5.0 LOL. Changing brake fluid is a good idea, I'd go with a decent parts-store DOT 4, or the best bang for the buck is MOTUL 600.
However, if you don't have a pressure bleeder or a vacuum pump, then you're going to have to do a gravity bleed (takes forever) or pump the pedal. If you do the pedal method, be very careful not to put the pedal to the floor, or even too far outside its normal operating range, or you might join the long line of people who have fubar'd their master cylinders trying to do the right thing. Then ya gotta do it all over again after installing a new MC and that's no fun.
Lastly, the asshat neighbors of AMP have forced the facility to employ a sound meter, and violations cost the facility and the organizers big bucks. If you trip the meter, you'll be kicked out. I don't know what the required level is on the autocross pad (I think it's 92 db on the road course, and that's further from the houses), but reading "flowmasters" triggers me to ask around the board at azsolo.com and see if they think it'll be a problem.
Last edited by MFE; 08-24-2015 at 05:07 PM.