V6 Euro 3 Manifold De-Cat Questions
I have a 2002 GTV V6 which as I understand will adhear to Euro 3 specifications which means it has two catalytic converters in each of the manifolds. My tuning insticts suggest that a manifold which instantly dives into a cat is actually going to really hinder performance and so there should be some significant gains to be had by removing them (15-20BHP?).
First question... is the 15-20BHP realistic? I'm not going to bother doing this for any less to be honest...
Second question... what do people know about the emissions situation? From what I can see there is little difference between Euro 2 and Euro 3 in terms of measured emissions, so as long as I keep the main under car cat do you think I will pass a UK MOT?
I know that I can use the manifolds off of many of the V6's in terms of them mating to the head, but, what I am concerned about is mating them up to the downpipes! I have seen a thread which shows the use of 164 or 166 manifolds but these had to be extended with some fiddly welding to mate up with the std downpipes. Needless to say, I would like to avoid this!
Third question... are there any options out there that would mate up exactly with the Euro 3 GTV downpipes - i.e. a straight swap of the manifolds?
Fourth question... last one... failing the above, could I use both the manifolds and the downpipes from an early GTV V6 (i.e. pre '99)? Even if they didn't mate exactly with the under car cat at least that would be an easier join to make...
Any thoughts or experience much appreciated guys!