Question-Pipe D off of header for 97-99? Which test pipes

[dawk]

Edit---Title should say pipe "OD" not "D"

What is the pipe OD off of the header for my '99 header? Is it 2" or 2.25"? Basically I am trying to figure out which test pipes I need to purchase? Dali has the 2.25" in stock, but not the 2" test pipes (in stock)? The test pipe would go from the header to the exhaust adapter pipes to the muffler. I think I may need the 2" OD pipes. Isn't the cats for a 97-99 have 2" OD inlets on each side.

These are the test pipes that are available:http://daliracing.com/v666-5/catalog/index_browse_part.cfm?focus=1513

These are the 2.0" pipes:http://daliracing.com/v666-5/catalog/index_browse_part.cfm?focus=820

 

[Mac Attack]

I thought it was only like 1.75".

But, you really need to consider your package as a whole anyways (headers, cat/test pipe, muffler).

You don't want to go from a 1.75" header collector to a 2.25" test pipe and then back down to a 2" muffler inlet. With the sudden expansion loss going into the test pipe and then the sudden contraction loss going into the muffler, it is probably more restrictive than just one sudden expansion to a 2" test pipe and muffler inlet.

So, if your muffler piping is 2", get the 2" test pipes. If it's 2.25" or larger, get the 2.25" test pipes.

Dave

 

[dawk]

Are the flanges the same size? Test pipes or Cats?