My friend says mods are a waste! :(

cheshirecat

As long as you revert back to stock before selling, it's usually not a problem. Simple things like intake or exhaust generally do not depreciate the value as they're considered common and minimally intrusive.

The 370 is not a cheap car to mod and the engine doesn't have much room to grow in terms of NA bolt-ons.

Post-Maf tubes/drop-in filters/test pipes/exhaust are, to me, a worthwhile investment. Diminishing returns kicks in pretty hard after this.

I would agree that the 370 is not a "good car to mod" compared to many FI vehicles that can get a 50hp/50tq+ boost from a simple ecu piggyback or flash for $500+/-