Bolt-on engine upgrades for a beginner?

Does it come with a turbo?

Best cheap upgrade you can do by yourself is getting the weight down as much as you can- sparewheel and others out.. I wouldn’t recommend any motortuning by yourself. It isn’t cheap, and if you do something wrong, it gets way more expensive, than letting it do in a dealership. I don’t know if your car has a turbocharger or not, but if it has one- do some softwaretuning. You gain some hp and it drives like a completely different car after the tuning

As for Bolt ons? Catback exhaust (aftermarket or custom) and intake are pretty simple.

Softwaretuning on an n/a engine isn’t effective in 99% of the cases. It isn’t cheap and you don’t gain very much.. 5hp if you’re lucky. In this case it’s better to maje sure the engine is clean und runs good.

Cold air intakes rarely increase power, just noise. I’d focus on doing as much weight reduction as possible, and do some handling stuff like sway bars and poly bushings

The 1nzfe is a fantastic motor, they are capable of 550whp without blowing up.. There are tons of different kits for it.. Depends on your budget, and what you want out of it. Cold air intake, exhaust, and other crap does nothing with these cars.. You may get 1-5hp with full exhaust and intake.. But you’ll lose torque..

For pepp you can do a turbo or supercharger but they arent exactly on the cheap end if you want quality

Lightweight wheels. Reducing unsprung weight will help with acceleration.

Air intake

There’s not really any ‘bolt-on’ upgrades that make any real power. Anything worth doing takes more money/time.
Best you can do without stripping down the block is exhaust, manifold, intake, possibly stretching as far as cams (although you’ll need the head off to do it up properly)