Here is the deal... my car has two large mufflers and one small muffler ( resonator ). I have all of this to make my exhaust sound as good as possible without cat. converters. Here is the question though...can these 3 mufflers cause restriction if they are all straight through? They have no louvers, just holes and there is no reduction in size internally and they have no bends.

Thoughts?

 

Nothing too significant unless they are small diameter.

 

My entire exhaust is mandrel bent and both the exhaust and mufflers are 2.5" except for the last muffler which is 3". I had a smaller exhaust on my Grand Prix and it put out 357whp though it was very restricted beyond that.