Long term reliability really comes down to how you take care of your car. If you get a solid install, tune and proper supporting mods it is all on the owner. Both kits are well made and will last for years, but it is the owner which will determine reliability.
-Doing all maintenance in time, oil changes (both motor & SC unit), filter changes, etc.
-Keeping an eye on the system in extreme use, super hot days, tracking abuse, etc.
I have over 40k miles on my GTM Stage 1 SC kit and still going strong. Going to be doing some maintenance soon, oil change for the unit & filter changes. Only issue I have had is I blew a belt around 25k miles into my install, they are suppose to last 40-50k, but things happen. Towed it back & put a new one in, no problems.
Also, determine what your goal is for going boost. Do you just want more power? What are your plans, DD, track, etc. Make sure you over budget and over plan for everything. If they say 3-4 days for something estimate 5-6 as problems can occur.
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