200 cel cats

 

It most certainly does, a larger bore pipe over the axle and small rear silencers, deleting the pre axle silencers adds 10-15hp (along with bigger crank pulley) The exhaust is a limiting factor on volume, along with the induction.

 

If you remove the bigger pulley, the power gain goes That causes the gain.

Nearly all TURBOcharged engines profit from a larger bore exhaust. SUPERcharged less.

Oh and 10-15 hp plus on a 363 hp V8 is not even noticable. Rule of thumb: around 10% powergain will be noticed. Everything below that is tolerances...

 

The dyno never lies. Are you going on actual real world experience of an XJR Daim? I've had 3 and played around with pulleys, exhausts and mapped engines - and the gain from just an exhaust mod does give gains, the larger pulley just accesses the torque curve earlier in the rev range, it doesn't give the oft advertised 10% gain they talk of, but add a proper exhaust and it does. My 100 has a full Paramount big bore fitted along with FIA approved race cats, with or without the pulley it eats standard R's.

 

Sean B is correct on the XJR tuning dynamics and for a supercharged or turbo charged car. And yes, dyno's don't lie. Essentially all we are doing is tuning is a big "air pump", more air in via the supercharger (or even more with smaller pulley) and more air out via a more efficient exhaust. I do it everyday to varieties of cars, it works

 

Had my x-pipe made and installed today. This car is a beast!!!

 

Sound? Looks like you got the mid mufflers removed or replaced as well?

 

Front and mid mufflers removed and x pipe installed. Cruising at 75mph you can barely tell the difference until you jump on the throttle then it howls. Such a deep throaty sound. When the s/c kicks in it gets even louder. I also noticed more power and improved throttle response

 

Nice tahoemedic, very nice... ...can you get us a recording of it?

 

working on that. been raining here today. I will say it sounds a lot like Daim's but with a bit deeper tone. When I stand on the gas, oh man it sounds like all hell is breaking loose behind me....and it definitely has noticeably quicker acceleration

 

trying to upload the video.

 

You have to upload through youtube then send a link to the forums.

 

<iframe width="560" height="315" src="https://www.youtube.com/embed/d9yzAu-n5u4" frameborder="0" allowfullscreen></iframe>

 

That didn't work. Help!

 

 

Nice V8 needed to be heard. Do you still hear that Supercharger whine?!

 

Sounds nice & throaty.

 

yes plus the added exhaust note as a result.

 

Do you have a diagram of your set up you could post, thanks.

 

It's identical to Daim's that is posted earlier in this thread. X-pipe replaces center/front muffler, delete the 2 forward mufflers just in front of the rear end, leave the rear mufflers in place.