Jada Upgrade Help!

[Xmodracer1]

I am a xmod racer, and my xmod stoped working. So i bought one of these jada rc cars. I want to know if this rc is customizable? I am a beginner at Jada, so please answer the questions.

Note: Can any one tell me if i could use any of these things on my Jada
Notice: The Vehicle i have is a 1:10th Scale Red Toyota Supra (49MHZ)
Questions: Can i connect (2) 9.6v battery packs to my 1:10 Jada without destroying anything?. Do you know any Motors that will make jada faster then stock? Do you know any magnets or fets i could put inside of the jada motors that could make it accelerate better? Anyway i could raise the rc frame off the ground more? ( it is always poping up when it taps something)
Projects: tell me if this was correct, i runned the motor non stop for 15 minutes, would this have rose any rpm's in the motor? I rearanged the antena wire off the RC body, and put it on the frame. It caused it to lose some range, any answers how to fix the range? ( it was about 50-60 feet of range, now it is down to 40-30 feet or maybe below that).

I am sorry if i am asking so many Questions, its because i am going to have a race with it this Saturday. ( need it as fast as possible, without messing anything up.)

What i have
Jada Toyota Supra Red 1:10 scale
9.6v Nitro Charger AC/DC (NICD)
9.6v Nitro Power Batteries 700MAH (NICD)
9.6v New Bright Charger (NICD)
(2) 9.6v New Bright Batteries (NICD)
AAA IC3's batteries (Rechargeable)
AAA Audiovox batteries (rechargeable)
Small Plane motor ( dont know rpms, and brand, it can almost fit in a zipzap).
Tyco rc Motor (25 volts to run the motor, it goes on a 4 wheel drive tyco rc).
Zipzap SE Red 1976 Gran Torino
Zipzap Motors (1:64 Scale RC)
Stock Motor: 16000 RPM + Red Gear + Green Gear + Blue Gear
Performance Motor: 21,500RPM + Red Gear + Green Gear + Blue Gear
Turbo Motor: 23,500 RPM + Red Gear + Green Gear + Blue Gear
Racing Motor: 28,000 RPM + Red Gear + Green Gear + Blue Gear
Xmod Honda Civic (1:24 Scale RC)
Xmod Motors
Stage 1 Teeth 8 RPM 26K (white) + white gears
Stage 2 Teeth 8 RPM 30K (white) + white gears
Stage 2 Teeth 9 RPM 30K (Yellow) + Yellow gears
Stage 2 Teeth 10 RPM 30K (Red) + Red gears
Stage 2 Teeth 11 RPM 30K (Blue) + Blue gears

I have some pictures of the Jada.