My SCT Tuner will be here Monday with a custom tune from Justin at VMP Tuning. I can't wait to see what kind of a difference this will make to my car. I know I will have to do some Dataloging after I upload, but have you found out that having a custom tune makes a difference big or small. I am not gonna sit here and bad mouth other company's out there. But I can tell you there is one out of PA that is terrible. No customer service, hd to go to my bank to get my money back after I ordered gauges and SCT tuner with custom tune. Never received anything, and they stopped answering my calls and emails. Needless to say I was given my money back and have been happy with Justin and VMP. Hopefully all will be even better after I upload my tune Monday. If you wanna know the company out of PA, message me and I will be more than happy to tell you!!!