Exhaust Baffle Inserts

[Weyro]

Was wondering if anyone knows if these things actually work.
You slip it in the end of your exhaust and its supposed to drastically kill the noise.

http://www.ebay.co.uk/itm/Silencer-Db-Killer-Exhau...

I love the noise of the car, but it can be a bit of a pain on long motorway drives.

[300bhp/ton]

They will affect db levels, how much you'll need to try and see on your setup though.

I think they can produce a lot of backpressure and lose HP, poorer running and huge heat builds.