De-Cat downpipe experiences

[Lots_Of_Trouble]

Im looking at buying the Aerie Performance or GRP De-Cat downpipe.

My questions are:
Has anyone installed this and not the rest of the exhaust system?

If so,what are differences in performance etc?

And also,will it be permissible for a track day,i.e not too loud?

 

[Milk242]

Lots of people do this, it’s called the third cat delete if you search the forum. From what I can tell, people usually pair the third cat delete with a valve controller.

 

[netsinah]

Im looking at buying the Aerie Performance or GRP De-Cat downpipe.

My questions are:
Has anyone installed this and not the rest of the exhaust system?

If so,what are differences in performance etc?

And also,will it be permissible for a track day,i.e not too loud?

There's a fair bit of commentary on the Forum to answer your questions but here goes:

-when replacing my OEM tires with all-seasons, the owner of the tire shop said he LOVED everything about the Emira (the first one he'd seen), except he felt it was too quiet for "a nice sports car".
-I agreed so I installed the GRP third cat delete and the Millteck valve control unit, also purchased from GRP
-I didn't do any other exhaust modifications
-this set up works well: it doesn't throw any ECU codes and with the valve control unit, you can vary your rear exhaust sound. So if you're worried about track day loudness, then go into "quiet/stock mode" and you shouldn't have any issues. It creates a great sound with all sorts of nice pops/gurgles which don't sound "cheap" IMO, unlike car exhaust modifications I've heard on some other vehicles
-I felt the price of these modifications was very reasonable and inexpensive for what you achieved
-personally, I didn't notice any HP/torque increase, but others claim it's there. I suspect it's not much and I think the sound difference is the main benefit
-if you have any DIY skills and tools, this is a fairly easy install and you'll find at least one Forum thread with good install advice, plus GRP provides directions on how to install both. If installing them, MAKE SURE to purchase a new exhaust ring gasket as well (about 10 bucks), since you'll find the old one crumbling and it would be ++ unusual to be able to reuse it
-or any good muffler shop will easily do this work for you. Good luck!

 

[geoffbland]

"So if you're worried about track day loudness, then go into "quiet/stock mode""

"Quiet" mode is probably not a good idea on a track day, "Quiet" mode keeps the exhaust valve closed and you don't want that at high revs such as you would have on a track day. "Stock" mode would be fine.

 

[netsinah]

"So if you're worried about track day loudness, then go into "quiet/stock mode""

"Quiet" mode is probably not a good idea on a track day, "Quiet" mode keeps the exhaust valve closed and you don't want that at high revs such as you would have on a track day. "Stock" mode would be fine.

I stand corrected. I never use "quiet mode" as defined by geoffbland and didn't mean it that way, but I can see how it could be taken to mean that. Thanks geoffbland for pointing that out. I don't think it's good for the engine to close the exhaust valves at any RPM, but that's just me.

 

[MTV]

I was seriously considering these. Have Aerie titanium Ypipe, 3rd Cat delete and exhaust with Miltech controller. Really good but does drone a bit. Fixed with extended top ends and some heat/sound deadening and it pleasant on long trips now. Still wails like half a v12 when I want but not obnoxious.
I actually only had this discussion with a very good exhaust place nearby. Their comment was it would go to a noise level even with one high flow cat in the third cat position that would then be too loud. Plus the issue of mixing Stainless and titanium at multiple points. So decided not to go that way but would love to hear any other actual opinions