IMO unless your going for high numbers, the ZL1 is cheap and with a bap it WILL support 700 rwhp i can tell you first hand. I already had the BAP installed so thats why i went with the ZL1. And its plug and play, I think most others are also. I did mine in the garage on my back, wasnt bad at all. Put a floor jack under the rear diff pull the sub frame bolts out and lower it down and pull the tank out. I think it took all of maybe an hour and a half. Hardest part was unhooking the parking brake lines.
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