A 1/4 revolution per turn difference is going to be almost unnoticeable. Maybe 1/10th at best. Your better option is the Motive 3.90's or even step up to 4.10's. I run the 4.10's in all 3 of my own cars and love them. A major difference! And my highway rev's aren't that bad either. Plus I am twin turbocharged and they still rock. Go with Motive performance series of FRPP only. Every other gear set we have tried make a ton of noise and aren't worth the hassle. Shoot us an e-mail for a quote if you would like. And don't forget to change out the bearings while you're in there. Timken USA made bearings only.
Just my 2 cents...
Eric@impulsecars.com