Since the pettit dp was installed on my 3rd gen the pipe has been leaking because one of the bolts was not put in. I need to fix this problem to stop the leak from putting echaust into my A/C and to make the car sound normal. What are the thread sizes of the Pettit dp on the front where the pipe attaches to the manifold? Thanks.

 

The downpipe doesn't have threads. I have the Pettit DP and it just has 4 holes for the 4 studs coming off the manifold...the thread sizes of the studs? dunno...is that what you are talking about?

 

The studs i guess. The problem is the weld on the front is so large the head wont stay. I gotta shave it down and then put in another where we didn't put it in. Anyone have the size?

 

this is the harware I used to install mine:

Three 1" long 10mm diameter stainless steel bolts and 1 allen head bolt (10mm thread) with lock washers.

I used a 17mm socket on the bolts and a 8mm allen on the allen.

The allen head was used in the spot you are having difficulty with.

Please remember to check the length/threads for proper fitment.