yea 400hp out of a 1.8 stock internals my fucking ass.

The easiest 1.8 to swap is the 94-97 1.8L. Although the 99-00 1.8l has a better Flowing head you cant adjust the timing.

A stock 1.8 can take like 12-14psi and make 250-275Whp. build the motor and they can make 600+.

you can turbo a 1.8 for 1500-6000 depending on the parts and end power goals.