OK. First of all dont say you need to see my dyno sheet for proof and say its BS if you dont. My signature says my mods. Here is my complete video of EVERYTHING ive done. I bought my car used witht he stillen catback on it and I did 243 (automatic). Watch my video, i have more than what my signature can hold in aftermarket parts. After headers I last dynoed it at 283 (dyno is in the video if your name is thomas).

Second. Uprev. I gained 3-5 on the low end and because it eliminated the throttle hesitation all g37's have stock and maybe 1-2 throughout. but its not about the power that you gain with the tune. its about making your air to fuel ratio safe and efficient. I dont know how to tune but I work at a speed shop and I know enough to know if you have an intake and any kind of exhaust it will help you and be worth it.

Im not about spending money without researching. I ordered my setup from a place in Pennsylvania. 215-855-5565. Etunes alone are $50 each time you email your data log off to a tuner so they can adjust it, but i havent paid for an etune because 3 etunes came with the $500. Meaning i log my stock tune and send it, they adjust it and email it back (THAT IS ONE ETUNE) dont expect to rent a dyno and then email your tunes of and get them back in 15 min, it takes a couple days cuz youre not the only one getting your car tuned. I later got headers on my car and i logged it and sent it and they were nice enough not to charge me so i reccomend them, not uprev themselves because they will charge you.

2008 Infiniti G37S Full Bolt on Overview: Full Stillen Exhaust, Dyno, Drag, Walkaround - YouTube

 

Heres a before and after. The first run was when the car already had stillen catback. The difference is 40 hp and i estimated the catback to have added already 10 so thats why I said 50.