MagnaFlow
Well-Known Member
- Joined
- Dec 22, 2014
- Threads
- 16
- Messages
- 412
- Reaction score
- 165
- Location
- Oceanside, CA
- Vehicle(s)
- 2015 S550
3" is recommended. The turbos are the biggest restriction in a forced induction setup, so generally the larger tubing dia you can use the better, but you will need to consider price, underbody clearance, etc when choosing a size. This is NOT the case for naturally aspirated vehicles.
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