BEST 3rd Cat Delete (for USA customer)

[CoryC]

I've seen many of the varying posts regarding Milltek and GRP and other decat pipes... now that we've been out for a while has one proven to be better than the other? I read early fitment issues needing an expander here and there, is that true for both? Has anyone done the decat only without the valve controller? Any insight appreciated...

 

[seriously]

I have the GRP cat delete without milltek. The sound is fantastic in sport and track, nearly silent in tour. In other words you don’t need the valve controller to unlock sound- it’s just an additional enhancer and control.

I don’t think there are significant differences between milltek and GRP, just preference. Had professional install so I don’t know if they used an expander. You’ll want an extra gasket with either.

 

[CoryC]

I have the GRP cat delete without milltek. The sound is fantastic in sport and track, nearly silent in tour. In other words you don’t need the valve controller to unlock sound- it’s just an additional enhancer and control.

I don’t think there are significant differences between milltek and GRP, just preference. Had professional install so I don’t know if they used an expander. You’ll want an extra gasket with either.

Thank you!

 

[scc.131.fe]

I have the GRP cat delete without milltek. The sound is fantastic in sport and track, nearly silent in tour. In other words you don’t need the valve controller to unlock sound- it’s just an additional enhancer and control.

I don’t think there are significant differences between milltek and GRP, just preference. Had professional install so I don’t know if they used an expander. You’ll want an extra gasket with either.

+1 (what he said).

Get a new gasket either way. Sounds great without the controller.

 

[patrickramdial]

I would definitely recommend the valve controller. It really does bring out the monster in the emira.

 

[kitkat]

I had no problems with the GRP third cat delete pipe, inexpensive and arrived in 2 days to me.

The valve controller added way more sound than the third cat delete, thankfully you can just control what modes you want. Kind of a no brainer to me especially at the price.

 

[Nova]

GRP decat seems to be the default choice here unless you had a specific reason for the Milltek one, such as if you wanted the Milltek exhaust as well and wanted to keep it all the same brand.

My take on the valve controller is that it's up to you. After break-in, you can drive in the sport mode, which opens up the valve and you get *most* of the sound that you'd get with the controller. The controller makes it fully open and you get the most sound, but I am not sure if it's a big enough difference. So, IMO, the only "benefit" of the controller is being able to fully open the valves in touring mode. I don't know if that's enough of a reason to get it. I know that for me, when I am driving out or coming home, I don't want to bother my neighbors so I like it to be as quiet as possible.

 

[Time2Fly]

I've got the Aerie decat. It's titanium and comes with their titanium exhaust. Just using the stock valve controller, and I run in sport mode everywhere except pulling into and out of my garage for the sake of my neighbors. The sound is terrific.

 

[Neb]

I just ordered the GRP decat. I forgot to get the gasket, my car have 900km on it, can I re use the gasket?

 

[Nova]

I just ordered the GRP decat. I forgot to get the gasket, my car have 900km on it, can I re use the gasket?

Unlikely.

It's not the number of miles. Based on pictures I've seen, the stock gasket is like a mesh/mastic material that is designed to squish on install but fall apart on disassembly. The metal one sold by GRP is like a crush washer that can maybe be re-used.

 

[jamesbxxx]

3rd cat delete is just a bent tube. I doubt there is such thing as “best” as long as it’s a straight swap fittment! I’m waiting for my Achilles to mend before fitting mine. So frustrating not being able to drive!

 

[NorCalEmira]

No sound or performance differences between the various 3rd cat delete pipes. Aerie is made of titanium but I believe lacks the milled out area for the gasket that is present with the GRP and Milltek pipes. Not a big deal but a little better design for optimal sealing IMO with the other brands. I was on the fence about the Milltek valve controller and I'm glad I went with it. You have a choice between factory valve operation and fully open operation that can be mapped to the homelink buttons on the rearview mirror. The fully open mode makes a significant difference in volume and you can shut it off on demand. Nice to have.

 

[MIGZ]

Hands down GRP, Local Company with great products and service.

 

[GRP]

I just ordered the GRP decat. I forgot to get the gasket, my car have 900km on it, can I re use the gasket?

I’d recommend getting a new gasket. The factory one is a one time use type piece.
Email us and we can add it on there for you so you don’t have any extra shipping.

 

[David s]

Hands down GRP, Local Company with great products an service

I’m in Australia. And I agree.

 

[patrickramdial]

I just ordered the GRP decat. I forgot to get the gasket, my car have 900km on it, can I re use the gasket?

I did my decat with around 300 miles on it I believe and the OEM gasket was NOT reusable.

 

[Vampyre]

The best mod I have done so far is the 3rd cat delete and valve controller, and yes you need both to unleash that sound!

 

[skydude]

Has anyone had issues with the Milltek valve controller? Mine is no longer working. Tried both remotes

 

[kitkat]

Has anyone had issues with the Milltek valve controller? Mine is no longer working. Tried both remotes

One person on the forums did and his melted because he mounted the control unit way too close to the exhaust, how is yours mounted?

 

[skydude]

One person on the forums did and his melted because he mounted the control unit way too close to the exhaust, how is yours mounted?

mine is mounted right behind the license plate. it was the only place that hid it somewhat,.