think of trying to go scuba diving with a bendy straw - hard to breathe in, or in the case of your exhaust, out.Quote:
Originally Posted by martinozcmax
Now replace the bendy straw with a proper sized snorkel - breathing performance much improved.
In short, many components of your exhaust are there to satisfy emissions criteria and to reduce engine noise at the cost of 'breathing' efficiency.
Mind you, if you overdo it with the exhaust, you can remove too much back pressure and end up with an engine that drops in performance - the mechanical equivalent of being winded?
Dullbird, i highly doubt the fuzz would be interested in the noise from your exhaust - the test involved is monitoring dB levels emitted 1m from rear of vehicle, on the opposite side to the exhaust exit. If the rules are still the same, anything under 90dB is ok (the same amount of noise as a 2 stroke mower from same distance!)
the Magnaflow on my old nissan regularly set off car alarms!
