Silencer bypass pipes ???

[Marcin]

Would you recommend to install these silencer bypass pipes for my 911 75' Carrera , which I use for hillclimb racing? We have no noise limits here! I am quite tempted - less weight and maybe few hp more.

Here is the decsription of the product from the dealer site

911 SILENCER BYPASS PIPES 74-89

World's lightest, most powerful exhaust system available on the market
Fits all 911 cars worldwide 1975-1989.
Maximum Power- more than ANY other Muffler/exhaust system. Very aggressive 911 sport-scar sound. Works with stock catalytic converter or our Catbypass Pipe/Euro-premuffler,
System comes with outlet pipe, clamp (not shown) and slip-on turndown ,Saves up to 30lbs (15KG) off the rear end of a 911 ,Eliminates all 911 Rear Mufflers

ID91122091102 € 84.83