Let's see:
Exhaust reviews:
Ninja G3: Good for AV7/10 and stock/kits. No kickstands, pedals clear, may have pedal chain issues.
Ninja G2: excellent pipe for AV10, especially 50cc kits.
Doppler Pipe: One of the best pipes for 70cc kits, unknown compatability with AV7 kits, not good on stock bikes. would need to bend out pedal arm, blicks kickstand
Leovince long pipe: Block pedals completely, kickstand ok, medicore performance, not for kits. Doesn't fit AV7 well.
Leovince black pipe(cobra?) stock replice, heavily restricted, block pedals and drags on the ground on a AV7.
Bidalot: Good pipe, especially for kits, unknown fitment.