Do you think these would make my car quitter then when I go for a blast I can open them up?.

 

Ebay item 320995944686

Not with your current exhaust no.

 

you will basically have your current sound when you have them closed (exhaust gasses flow through your normal exhaust).

When open, exhaust gasses flow through a "cut out" and create noise.

 

See this vid of my VXR8 when I had them fitted:

 

Love the vx8 there different valves to the ones on ebay

Or this one 261031706327 but could struggle with space ?

Same theory.

 

You see where the cut-out pipes are bolted on to my exhaust? Well that's where the valve is (same kind of butterfly valve as your ebay link)

 

Think about it for a moment - how would placing that valve quieten your exhaust if it was placed in it? Well, actually, if it was closed it would - it would cause so much backpressure your engine would stall and you'd have no noise at all.

 

These valves are designed to be placed just before a cut-out pipe.

So you could get a garage to modify your current exhaust and fit them into a Y pipe on each side. But you would still have your current sound when they are closed, and louser when open.

 

So it wouldn't work if it decreases the internal diameter of the pipe?

All you are doing there though is creating more back pressure.

Not something you really want to do on a Turbo car. Or any car for that matter.

 

And how would you know how open or closed it was? You would risk trashing your engine.

I dunno why you just don't get a pair of resonaters welded in.