I have a 09 Tahoe 130xxx miles 5.3 4x4 stock everything except rims/tires i want to get performance parts and basically just mess around i also don't want to spend buckets of money (i dont really have a limit on spending just dont like the idea of dropping a few grand on a single thing) everyone i see says intake, exhaust, and then tune things i want to know is there a intake exhaust tune combo that works best? what is the difference between intakes? is there one that is better than the rest and which i should aim for? i have seen k&n, volant, and cold air inductions mentioned but not many others do all these perform the same? same thing with the exhaust setup is there a header/exhaust combo that is good and won't break the bank? i have seen $300 long tube headers and $1300 ones could e85 be an option since mine is flex fuel i have read about getting a cam or different gear ratios i dont know anything about those really is there other mostly diy mods i can do and get more power without sacrificing too much reliability? are there things i should look into first before i think about more power? are there basic maintenance things i should look for to get more performance out of a high mileage engine? are there things i should outright avoid? any info or pointing me to info would be great i would love to see before and after numbers on a lot of these mods but can't find anything really.