got a problem with my focus RS. where the trubo joins the exhaust maniflold it is blowing. i can smel the fumes int he car ewn i pull up to lights and stuff. i put it in a few weeks ago and they found nothing!!! cos they are tossers!!! since then i have fitted a dump valve and samco boost hoses. will this void my warranty?? just cant be arsefd to swap it all around again.