I put mine in about 15k miles ago. I have yet to recharge mine yet but of you just clean your MAF sensor and don't over oil you'll be better of on the mpgs. I've notices mpg gains since I put mine in and charcoal deleted. Like on average 1.5 mpg more. Idk why people think that it sounds noticeably better though bc it really doesn't.
18" Type 67s|Charcoal Delete|K&N Drop-in|Rear Fogs|Cool Carbon|De-Badge|Blackout Kidneys|Custom Exhaust