Hi @all,
I´m not so often here in the last weeks but now I´m back
I´ve used 2 middle mufflers from a BMW CSL (year of construction 1971 I guess) with 50mm exhaust pipe at the beginning (till the first muffler) and 60mm up to the end (in stainless steel). You can get the mufflers from e.g. Bosal.
The mufflers are very flat, so it isn´t difficult to place them under the car.
The first time the exhaust wasn´t so loud. But in the meantime I think all noise reducing parts were blown away .
I´ve made some sound level measurements:
98 dB in idle (Leerlauf) up to 110 dB @7000 U/min
In the next days I try to record the exhaust system and also the sound with my handycam and upload it to this site.
Best regards
Lars