Anyone straight pipe their exhaust?

[docron]

As I prepare to install GRP HF DP and I am kinda underwhelmed with the exhaust note being too soft despite having GRP Ti exhaust as well keeping the valve always open, has anyone custom fabricated a straight Y pipe from DP to tips yet?

Coming from the 4C where I had an aggressive but not obnoxious Magnaflow exhaust without drone, I am yearning for a more aggressive exhaust note.

Rather than responses like "why would you want louder? " Or "OEM exhaust sounds fine..." etc., I want it louder and OEM exhaust sounds weak which is why I am asking this question. and yes, I know the potential implications of decreased back pressure without a muffler and all that crazy twisty exhaust piping but ECU should adapt right?

Seems like an easy fabrication...Y pipe from DP-midpipe connection to tips in the rear bumper with hangers. Would you go 3" full Ti or stainless?

 

[FST]

Do

As I prepare to install GRP HF DP and I am kinda underwhelmed with the exhaust note being too soft despite having GRP Ti exhaust as well keeping the valve always open, has anyone custom fabricated a straight Y pipe from DP to tips yet?

Coming from the 4C where I had an aggressive but not obnoxious Magnaflow exhaust without drone, I am yearning for a more aggressive exhaust note.

Rather than responses like "why would you want louder? " Or "OEM exhaust sounds fine..." etc., I want it louder and OEM exhaust sounds weak which is why I am asking this question. and yes, I know the potential implications of decreased back pressure without a muffler and all that crazy twisty exhaust piping but ECU should adapt right?

Seems like an easy fabrication...Y pipe from DP-midpipe connection to tips in the rear bumper with hangers. Would you go 3" full Ti or stainless?

View attachment 66280

Do you have any drone in your ti setup?

 

[jp129]

Don't think we have anyone on this forum running a straight exhaust setup. You could try and let us know !

 

[docron]

Do

Do you have any drone in your ti setup?

Zero drone in GRP Ti setup. Almost EV like….

 

[F1 SML8R]

@docron Do it, do it, do it!

BTW, I had the dual exit Y Magnaflow on my 4c and the sound was indeed glorious. My only rub with it was the "Y" connector kept cracking even after being re-designed a couple of times, but it was all about the sound!

 

[Blackthought_]

Zero drone in GRP Ti setup. Almost EV like….

Is the GRP TI sound less aggressive that stock + decat + milltek controller?

 

[675430VME]

i4 straight pipe setup.
Btw, SS sounds so much better than Ti on the turbo, ask @Milk242 who had listened to both SS and Ti side by side. SS almost sounds like a V6.

 

[docron]

Is the GRP TI sound less aggressive that stock + decat + milltek controller?

I have i4 so I don't have third cat. But GRP Ti with miltek valve open is definitely more aggressive than stock. But I want more aggressive.

 

[docron]

Shouldn't be that difficult right? Pretty straight forward. And then just keep Miltek valve controller connected separately and tuck it up in the rear bumper to keep CANBUS satisfied.

 

[Milk242]

There was a post awhile back who did build a straight pipe exhaust for the i4. https://www.emiraforum.com/threads/built-a-custom-downpipe-and-exhaust-system-for-i4.5326/

 

[Milk242]

i4 straight pipe setup.
Btw, SS sounds so much better than Ti on the turbo, ask @Milk242 who had listened to both SS and Ti side by side. SS almost sounds like a V6.
View attachment 66295

Yea @675430VME exhaust did sound better than the others who had TI exhausts. It was actually fairly deep and very aggressive sounding.

 

[F1 SML8R]

There was a post awhile back who did build a straight pipe exhaust for the i4. https://www.emiraforum.com/threads/built-a-custom-downpipe-and-exhaust-system-for-i4.5326/

Except this version takes out the downpipe as well (i.e., this starts all the way up on the turbo). I think @docron was considering starting from the downpipe exit which is where all the aftermarket exhausts begin.

 

[675430VME]

 

[675430VME]

Except this version takes out the downpipe as well (i.e., this starts all the way up on the turbo). I think @docron was considering starting from the downpipe exit which is where all the aftermarket exhausts begin.

The track car from Lotus racing academy in China has a straight downpipe and exhaust. Trust me, your neighbor will hate you for it.

 

[Kaz]

The track car from Lotus racing academy in China has a straight downpipe and exhaust. Trust me, your neighbor will hate you for it.

He has no neighbors, very lucky lives in gigantic property! I also think the car needs to be waaaaay louder, our 4C's were almost a menace to society lol

 

[docron]

He has no neighbors, very lucky lives in gigantic property! I also think the car needs to be waaaaay louder, our 4C's were almost a menace to society lol

Benefit of living out in the rural countryside. lol

 

[Lotus F1]

I love the idea of a no muffler exhaust. Not sure how the ECU would, 02 and egt sensors are going to be confused no?

 

[chirowolf]

My Evora NA was straight piped for 10 years. No CELs no issues

 

[F1 SML8R]

My Evora NA was straight piped for 10 years. No CELs no issues

Loved my evora, but it didn't have an electronic valve to contend with. The good old days of vacuum line operated exhaust valves.