with a wrx to reach 350whp all you really need is
em-700(depending on what you use could be a lot less)
when tranny breaks-4500-5000.
look on peoples face when a 4door 4banger shoots out the whole and runs low 12's and possible 11's-priceless!!!!
thats just a high ruff est. you can get a lot of these parts for a lot cheaper.