? for you exhaust experts!

I've pretty much decided on a MAC exhaust system. I have a few questions, knowing I'll be adding a blower next year: long tubes or short tubes, and why? And, off-road or cat-back, and why? Will I FEEL either of these mods? Thanks for your input!

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'90 LX 5.0; 12K original miles (no sh*&); 3.55 gears; pulleys; Edelbrock Performer Heads;
BBK shorties; MSD 6AL ignition system; Motorsport E303 cam; 75 MAF; 70 TB; Eibach spring kit;
Southside sub-connectors; K&N cone filter charger; Hurst shifter; fiberglass cowl hood; A/C-less;
rear seat-less; cat-less; Flomasters; Corbeau racing seats (fronts); 12.513 @ 108 mph