GRP Emira Decat Pipes Now Available!

[1stLotus]

I’d be curious to hear all the different exhaust setups is an exhaust shootout. I’m debating between a decat and keeping the original muffler or keeping the 3rd cat and getting a Milltek or GRP muffler that is more of a straight-through setup.

Can anyone describe the differences of the two?

 

[GRP]

I’d be curious to hear all the different exhaust setups is an exhaust shootout. I’m debating between a decat and keeping the original muffler or keeping the 3rd cat and getting a Milltek or GRP muffler that is more of a straight-through setup.

Can anyone describe the differences of the two?

I typically recommend starting with the decat pipe, driving it for a while and if you want more then look into getting the muffler at that point.
We have some video planned to show the difference between the decat and the decat + our muffler setup asap. Just waiting on the videographer.

 

[1stLotus]

I typically recommend starting with the decat pipe, driving it for a while and if you want more then look into getting the muffler at that point.
We have some video planned to show the difference between the decat and the decat + our muffler setup asap. Just waiting on the videographer.

I appreciate your recommendation - it’s super helpful. Btw, I already picked up your decat

 

[ADC]

I typically recommend starting with the decat pipe, driving it for a while and if you want more then look into getting the muffler at that point.
We have some video planned to show the difference between the decat and the decat + our muffler setup asap. Just waiting on the videographer.

Not to be difficult (well, actually, totally being difficult ), but could you pretty-please-with-sugar-on-top also try to include what just the muffler change without decat sounds like?

I'm in the camp of wanting to go with the GRP titanium system after the cat (for weight reduction and some sound increase when valve-open), but don't really fancy taking out the 3rd cat and a) possibly complicating my life with MOT test failures / tickets from Mr Plod, and b) pissing all my neighbours off. I definitely care more about sound quality than outright volume.

 

[GRP]

Not to be difficult (well, actually, totally being difficult ), but could you pretty-please-with-sugar-on-top also try to include what just the muffler change without decat sounds like?

I'm in the camp of wanting to go with the GRP titanium system after the cat (for weight reduction and some sound increase when valve-open), but don't really fancy taking out the 3rd cat and a) possibly complicating my life with MOT test failures / tickets from Mr Plod, and b) pissing all my neighbours off. I definitely care more about sound quality than outright volume.

We could do that, the decat is an easy swap so we will get some video of just the muffler setup installed as well.

 

[Citizen]

GRP Decat + Milltek controller valve mode open

 

[Go Kart]

GRP Decat + Milltek controller valve mode open

Are pops and burbles present? The video cuts off before they would be heard.

 

[K_Squared]

Are pops and burbles present? The video cuts off before they would be heard.

Lots of burbles on the overrun. Not really 'pops' though like you hear on BMWs and the like. I think it's perfect with this setup. Apart from maybe the Larini exhaust, I've yet to see any other videos/comparisons that would compel me to do anything further with the exhaust than these two small mods.

I'm waiting for @GRP to change my mind

 

[scc.131.fe]

Lots of burbles on the overrun. Not really 'pops' though like you hear on BMWs and the like.

I am surrounded by poppin' idiots in their BMWs around here, hopefully the fad passess.

 

[tnbuilder]

I am thinking just the decat and valve controller too. I would like to see more videos of just the decat and controller. The very few I have seen are not great...most of the good videos are of a full exhaust.

 

[K_Squared]

Got these today by a photographer while doing an Emira photo shoot. Sorry I didn't get any stationary rev vids, I'll get some of those soon and add. This is with the GRP Decat pipe + Milltek full open. That's it! Use some good headphones.

 

[GRP]

Got these today by a photographer while doing an Emira photo shoot. Sorry I didn't get any stationary rev vids, I'll get some of those soon and add. This is with the GRP Decat pipe + Milltek full open. That's it! Use some good headphones.

View attachment 41301
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Awesome! Thank you for sharing. Would you mind emailing these to us?

 

[K_Squared]

I am surrounded by poppin' idiots in their BMWs around here, hopefully the fad passess.

My 340i with the M Perf exhaust does lots of pops in stock form. I'm not a huge fan, either. I plan to tune them out when I get around to it. They're a bit too "I'm 21 and I got a bimmer!" for me at 38 years old.

 

[K_Squared]

Awesome! Thank you for sharing. Would you mind emailing these to us?

DM'd

 

[1stLotus]

Awesome! Would be nice to have a comparison like this back to back eventually like this: . The only difference between the two is that the R version doesn't have the 3rd cat (which comes in stock form).

 

[EZcheezy]

anyone know how open the valves are open in tour / sport / track?

im assuming the miltek controller puts it at 100% open?

 

[GRP]

anyone know how open the valves are open in tour / sport / track?

im assuming the miltek controller puts it at 100% open?

Based solely on observation of someone changing modes in the car while I watched the valve on the lift I noticed that sport and track open the valve roughly 30-40% at idle and then it opens gradually as the rpms increase to about 4500 where it is open 100%
The controller bypasses that and will open it 100%, 0% or have stock pass through function.

 

[TCB]

FYI, Lotus of Naples said that they would do 3rd decat delete on the Emira.

 

[brainf18]

I typically recommend starting with the decat pipe, driving it for a while and if you want more then look into getting the muffler at that point.
We have some video planned to show the difference between the decat and the decat + our muffler setup asap. Just waiting on the videographer.

For comparison, please use a decibel meter at a fixed distance from the exhaust and in the cabin at WOT and cruising at Highway speeds. Its sometimes hard to "hear" the difference on a video....but the decibel meter gives a good reading of increased volume and how much "drone" can be expected when just cruising from A to B.

 

[Rapture]

I installed the decat pipe and exhaust controller in my garage today on 8-inch Race Ramp wheel cribs (really liked those btw). It wasn't too bad, but I definitely needed that rubber mallet and a 2X2 to get the third cat to exit. Install was very straight forward, Greg provides great instructions.

These products are transformational to the sound yet provides flexibility to adjust to your preference at the moment.