B bigballsbilly Active Member Joined Mar 29, 2014 Mar 27, 2017 #1 I have a 3" RJC downpipe and a Pypes 2 1/2" exhaust. Do I need a test pipe that reduces from 3" to 2 1/2"? All I see advertised is either a 2.5" test pipe or a 3" test pipe.
I have a 3" RJC downpipe and a Pypes 2 1/2" exhaust. Do I need a test pipe that reduces from 3" to 2 1/2"? All I see advertised is either a 2.5" test pipe or a 3" test pipe.
blackazz Not a Gn TurboBuick.Com Supporter! Joined Sep 1, 2008 Mar 27, 2017 #2 The test pipe should bolt up to the cat back system.id go with whatever size your downpipe is. Sent from my SM-G920T using Tapatalk
The test pipe should bolt up to the cat back system.id go with whatever size your downpipe is. Sent from my SM-G920T using Tapatalk
T TRICKSIXPA East Coast Go fast with class club MAGNA!!! Staff member Joined May 27, 2010 Mar 27, 2017 #3 Nope the 4 bolt flange will mate together. No Adapter needed. Sent from my iPhone using Tapatalk
B bigballsbilly Active Member Joined Mar 29, 2014 Mar 27, 2017 #4 Ok gotcha, I didn't know if 3" of exhaust suddenly going through a 2.5 inch hole with no gradual slope would cause turbulence, but I guess not. Thanks for the help.
Ok gotcha, I didn't know if 3" of exhaust suddenly going through a 2.5 inch hole with no gradual slope would cause turbulence, but I guess not. Thanks for the help.
T TRICKSIXPA East Coast Go fast with class club MAGNA!!! Staff member Joined May 27, 2010 Mar 27, 2017 #5 The flanges will match up but inside there might be some deflection. There should be no issue with performance Sent from my iPhone using Tapatalk
The flanges will match up but inside there might be some deflection. There should be no issue with performance Sent from my iPhone using Tapatalk