buickturbot

Just received a 5" turbo back kit for my truck, and the muffler reduces back down to 4" internally. Can anyone verify this for me. From the searching and PM'ing I have done, Ive been told that theirs is 5" all the way. Silverline Is trying to tell me that they did this because trucks were throwing a check engine light do to not enough back pressure.

Thanks Adam

Zeus1987

the turbo should provide all the back pressure you need. for what its worth when my 05 had 5 inch turbo back straight piped it did not set off a check engine light.

JP-4.5

Now I know why you PM'd me...

buickturbot

Trying to make a case so I can call Silverline. Anyone else?

Dieselhed

I have a Silverline single 5". It is 5" all the way through. Bought it about 18 months ago. Twins set up with no codes. Sounds better than my 4" mbrp did.

tcr

Yes, Silverline is just exactly like Magnaflow, it's actually about 3 7/8" ID. Good luck as I had this same fight w/ Magnaflow. They told me their system was not for "highly modified trucks" only "slightly modified trucks" and a 4" muffler was needed to allow the best gains on a stockish truck. I was pizzed off just like you and said a 5" system means 5" all the way; all they offered was my money back, never a true 5" ID muffler.

tcr

The silverline 5" system I looked at(because I didn't want my Magnaflow) did have the same muffler, you might want to check yours.