hi,
i have just caried out the following mods to my 2004 wrx. sports de-cat 3" system, hayward & scott up pipe, td05 16g turbo, 550cc injectors.
i havnt had it remaped yet but! drives fine and feel the power up until 4000 rpm then a bad misfire, no engine, ecu lights come one. i know i havnt had a remap yet but shoudnt be this bad should it?
one thing someone did sudjest to me was ngk grade 7 spark plugs that i have not installed would this be the problem?
Thanks