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I'm getting ready to fly out to Charlotte NC where I'm in the process of buying a 2016 C7 Z06 with less than 25k. The car is being sold as a 750 horse power car, with "aftermarket longtube headers, aFe power cold air intake, upgraded smaller supercharger pulley, MSD spark plug wires" done to it. (I copy and pasted this from their website.) When they had the car it didn't have any cats so to sell the car they had to add cats to it to make it legal to sell, then they retuned the car with a third party.. Now, my question is should I be worried about having to upgrade any internals, I have read countless times that the engine is stout and reliable. I'm just curious because its quite a bit of money to be spending. Also the car will be making a 11 hour drive back to where I live just a few days after purchase. Any advice or reply would be appreciated. I'm going to call the tuner tomorrow and see what his recommendations are, hopefully the dealer will give me their tuners number so I can bother those guys with educated questions.
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I don’t think I would worry too much about what has been done unless there is something you haven’t mentioned. Sounds like they were just trying to make the car emissions compliant.
 

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Any time you buy something with heavy mods I suggest that you may not know where that car has been. Then you need to think about day-to-day reliability. Then you will put a highly modified car on the road. 11 hours in a is a long way to travel. All you can hope is that whoever did all that stuff knew what they were doing.

Speaking from experience.
 

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Your first concern is if the car will pass any SMOG or visual checks, as long tube headers are federal illegal
Second is most time with LTH is they had to move the O2 sensors which is also illegal, and they may have
yanked out the 2 rear O2 sensors

The concern next is if the PCM tune that was done is good, crap, fad tuning cyberspace'rs promote that ends up to be a cluster screw over and if the tuner locked the PCM, and if so no one else could easily fix the screwups in the tune, and you're forced to buy another PCM and start all over again for a correct tune.
They also via the tune hid crap by turning off PCM error codes, so you're blind to real issues

Thus ask the questions from buyer before buying a long distance supercharged Z06
 
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