what to do

[99 sleeper vert]

i am gonna try to get 400 hp was wondering what ideals people have to get there want it n/a


its a 1999 4.6 5spd vert with 56k (its a dog lol)
things i have done so far magnalow c/b,bbk cold air kit,b&m ripper shifter

[SquirrelNutz154]

Id start by porting n polishing everything, then get a new cam. Thatd be the best way to start.

[ScottEvil]

400hp n/a is near impossible without getting a built short blockfrom DSS or VT, port and polished heads, race cams with new valves&springs, aftermarket intake like reinhard, long tubes. Doing some port work on the intake and throttle body, bigger injectors, bigger fuel pump and probably still fall short of 400. 300-325 is a more obtainable goal unless you have bookoo money and then why would you have a gt and not an 03 cobra?

[Danger Dude]

Actually 300 is very easy with 4.6. 350 is a little tougher and 400 you will need major engine work or a nitrous system to get there like ScottEvil said

[97Stallion]

And just so you know, you're connecting rods are pretty weak. They're formed from powderize metal, so it doesn't take much more horsepower to cause them to fall apart. I don't mean to scare ya, but I would take care of the internals before you go buck wild crazy.

[whipster24]

yeah, you can probably take the 4.6 up to around 375/400 rwhp pretty safely (on stock internals). You just have to know what your doing and do it right.