jedi - I like the 35 amp packs especially in sedan and and form of stock racing. They usually have more punch in stock but in mod there is a very noticable difference. For the carpet nats they sent packs that were done at 30 instead of the 35 like we had been running since the beginning of the year. While the packs tested the same and ran good on the track - the ones that were matched at 35 did have more power and it equaled about 2-3 seconds of improvement on a 5 min run.... In 1/12 mod it's a toss up since running a consistant pace is always the best, but in that case I still used the 35 amp packs but just charged them softer (5 amps) to get that more level voltage for the 8 minute run....