sounds like you need a hydro-boost unit. DO NOT add steer aid or any other magic sealer in a can! all that is is a chemical that soften an swells bad seals. then will rapidly deteriorate them. Then, you'll be doin a box and pump too.
Efi Live, diamond eye down pipe, 4 in front pipe & eliminate cat, egr block off plate. Lower egt's = more power and will also have better flow through turbo.