[Ace23]

Not that my two cents mean anything but here is my experience. A dyno tune with a tuner who knows what they are doing is a GREAT thing. I'm looking at going to 3" exhaust and I've asked for a 02 bung to be welded in. I would like to have the wideband to check my part throttle AFR. Personally I would spend my money on having my car tuned and then if you want to use a wideband you use it to double check your tune. If you can get your car to a tuner that knows what they are doing it will be the best $300-$400 you can spend. If you want to take a go at tuning it with a wideband then go for it just be prepared for the learning curve.