Some years (20?) ago when I owned a 79 GLS 1.6 I added the under bonnet insulation from a diesel, and then later the centre muffler from a diesel. Suprise suprise, the car actually went better with the extra muffler and was much quieter! The slight increase in back pressure improved the mid range torque, with no noticable loss of power at high revs.
Cheers...PG
Cheers...PG
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