Going to be (hopefully) installing my new 3" WBody Store downpipe tomorrow. Does anyone know the sizes of the bolt threads for the cat to exhuast flanges and the manifold to DP flange? Pretty sure if not all of them, at least one or two will not come out nicely and want to replace them. Would prefer to go to the store BEFORE I start rather than stop mid job.

Thanks,

 

I believe these are the right numbers...

10mmx1.50pitch

Fronts are 30mm long and backs are 25mm long.

 

Thanks, it is much appreciated.

 

Well, this did not get accomplished. Two things combined to beat me on this, my jack and my gut. The jack doesnt go high enough to lift the car to a point where I fit my fat *** under it AND effectively do any work. Hope to find a muffler/exhaust shop that can get it on a lift and throw it in. Hope that coming with all my parts in hand they can be done within an hour and only charge me labor.