how did you trim it? can you post a pic nightmare?
anyway, try looking for the THS brand pipes. the maker of this pipe also produces the same pipes for rd logics and other big brand producers and i think its relatively cheaper. pipe and manifold (the one especially for ntc3) costs about $45 here in our lhs. but, rc-mushroom has this pipe similar to what im saying which is made by hong nor
http://rc-mushroom.com/product_info.php?products_id=763
selling for $39