I?m running a 19t with npr- stage 2 rsi cam- 800cc inj. - 3in ex. My exhaust housing is cracked and leaking real bad. I?m gonna buy a exhaust housing to fix it. I saw that they offer a 7cm housing vs 6cm. My question is; will I need a bigger turbin wheel? Or is it plug and play. I?m a aware of tithe different housings. I have the angled one which the offer in 7cm. Thank for the help.