| I have spelled this out many times, and instead of writing it out again I'll just copy and paste what I wrote before. The RB should be able to put out considerably more power than the SR. Remember, engine weight is only a small percentage of the total car's weight, so if you put in an engine that's only half the weight, you still didn't make much of a difference percentage wise. The 240Z is about 2400 lbs- say the stock engine is 400 lbs. That makes the chassis 2000 lbs. If you had a real light engine like the SR that weighed 300 lbs, your car is now 2300 lbs... it's still about 95% what it weighed before. The RB will put out much more power to your rear wheels than the SR can put out at its crank. I hear 400 hp is quite a good number to put out with the SR, and with 500+ you're making it into magazines. On the other hand, put out 650 hp to your rear wheels with the RB, and you didn't do anything special. 750 rwhp has even been done plenty of times with that engine. So by going with the RB, the car will only weigh about 5-10% more than it would with the SR, but it can put out about 50%-100% more power."
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