In my honest opinion I don't think you'll feel much except for maybe slightly better throttle response (?) from the intake alone. HFC or test pipes will give you some pretty good gains though. Don't bother with K&N drop in filters if you're getting an intake. Test pipes are just plain pipes that replace the stock cat. If you get resonated test pipes, they are just plain pipes with a resonator on it more or less. HFC is a high flow cat, it is still a catalytic converter but redesigned to have better flows.
HFC = you still have a cat
Test pipes = don't have a cat
Test pipes make better gains though, and sound different. I tend to think that HFC sounds slightly more raspy. If you live in a place where emissions isn't a problem, I would go test pipes. HFC's tend to break very easily as well over time too.
They are simple to install but it's not something I would recommend you to do alone. It's just a few bolts, but the 2 connecting the cat to the headers are a huge pain to get to. Stock exhaust will be fine, but it will most likely sound raspy and possibly like crap with a HFC/test pipe lol.
No modifications needed for cat replacements or intakes, all simple bolt on mods.
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