Been thinking.

[TimW]

This may sound mental, but I am going mental.

Right first Question before i embarrass myself here, ready.

*Q* Is there allready a speed 6 de-catted manifold, not the de-cat pipes but a new smaller bore manifold and joining piece from the manifold-main exhaust. So what i am saying is their a new smaller bore manifolds and joining piece.?*Q*

Thanks for any reply.

[J_S_G]

*Q* Why?

Not that I know the answer to your question...

[Cyberhuss]

WoW something JSG doesn't know the answer to

Maybe it makes the car more louder?

[J_S_G]

Am just very curious as to why you'd want to narrow the exhaust manifold.

Edited to add: unless there's some theory running through Tim's brain about the issues with back pressure when de-catting a Tusc

>> Edited by J_S_G on Monday 11th April 20:02

[HarryW]

I thnk he is thinking along the lines that recently 'alans' posted that he seems ot have a hole in his torque curve with the cat by-pass pipes fitted .
He may have also noted that my little 4ltr RV8 'likes' a slightly smaller bore manifold than standard .
However given the amount of power the Speed6 produces I would have thought the exhaust is pretty much already optimised, hence the bannna pipes. The best indicator though would what do the racing T400R's have in that department.

Harry

[J_S_G]

HarryW said:

I thnk he is thinking along the lines that recently 'alans' posted that he seems ot have a hole in his torque curve with the cat by-pass pipes fitted . He may have also noted that my little 4ltr RV8 'likes' a slightly smaller bore manifold than standard . However given the amount of power the Speed6 produces I would have thought the exhaust is pretty much already optimised, hence the bannna pipes. The best indicator though would what do the racing T400R's have in that department.

To be honest, I'd tend to agree that there's a dip in torque lower down the rev range with the cats taken out. Top end I don't think there's any negative effect, though. The improved throttle response made up for it in my book, but I can see what he's thinking... and I tend to agree that it might be the way to go if the money's available to fund it.

[Cyberhuss]

Don't you hate it when someone ask's a question takes a shuttle to the moon?