Re: Removal of 496HO restriction plates
 

I've not yet had the proper conditions to get good top-end numbers. I have noticed two things: the engine has a louder, deeper rumble (good) and mid-range acceleration, especially around 4,000 rpm, is noticeably improved (very good). I'll post more when I can get some good WOT numbers. The extra mid-range punch alone is worth the effort.

Re: Removal of 496HO restriction plates
 

Still interested in any op-check results on the removal of the turbulators....

Most of what has been said (and that's very little) sounds like it definitely makes the HO a little louder; and possibly 100 rpm more....?

Any other debriefs...?

Re: Removal of 496HO restriction plates
 

I posted on another thread about this but I'll say it here too. I took mine out and was not impressed. I think I lost a little torque and my hole-shot suffered. Mine are going back in.

Re: Removal of 496HO restriction plates
 

Well now that's interesting. I wonder what it is about opening the exhaust orifice another inch in diameter that would cause a diminish in performance? Because isn't it essentially the same as putting a set of headers on to help the engine breath better?

Anyone else...?

Re: Removal of 496HO restriction plates
 

but moving the peak torque RPM up I bet without them...

Re: Removal of 496HO restriction plates
 

I am not impressed with mine removed either... debating whether or not to put them back in..

Re: Removal of 496HO restriction plates
 

I removed mine about a month ago and saw a little increase in top speed. My fastest top speed went from 74.5 to 76.3 m.p.h. recorded on GPS. I haven't noticed it being any louder.

Re: Removal of 496HO restriction plates
 

You would think though that providing the exhaust path an extra inch diameter (3" to 4") to improve exhaust gas flow would make a positive difference...?

I'm kinda waiting until i find a polishing place to take the paint off and polish the risers while I have them off. I only wanna take'em off once....

Re: Removal of 496HO restriction plates
 

Anyone got any updated info ???

Re: Removal of 496HO restriction plates
 

Raylar posted on this a few days ago where someone was questioning after market ex manifolds for the 496. He said it was good for 15 hp during dyno testing and it was part of his upgrade. The manifolds that give a 40 hp increase are being compared to stock restricted exhaust,if you compare it to one with restricters removed then it would only be a 25 hp gain which sounds believable,Smitty