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View Full Version : Back box strange clearance



fassi1
09-01-2014, 02:53 PM
Looking in to details of the after market exhaust systems discovered that fujitsubo and HKS back boxes
have very small inside clearance around 2 1/4" and 3" entrance.
The whole fujitsubo cat back system is 3" so my question is why would you decrease the clearance right at the end so much?
Many people build their systems with 2.5" in to 3" downpipe and popular fujitsubo catback system thinking about best performance
but isn't back box in this situation restrictive? I would say that back box is restrictive for this configuration.
What are your thoughts?