Surprised by GXP Exhaust on 2.4L

[Ronzer]

Originally Posted by Fhaeton I have Nissan Z drivers scared to even challenge my Soltice 2.4 with the Magnaflow duels and Gxp rear facia. The sound alone makes them nervous to pass me.

Fhaeton,

I'm thinking about installing Magnaflow duals on my 2.4. I'm assuming that it bolts right up. Anything I need to know before installing ? I'm really anxious for the "new" sound.

Thanks.......

Ron

[idkfa]

the 'sound' of the dual magnaflow is actually incredible from all of the videos i've seen. I don't know about any drone though.

OP - all we heard from the beginning was that with the loss of back pressure due to the more free-flowing exhaust low-end power actually decreased.

have you noticed that?

[Stealthy4]

To be honest, i didnt really have any high rpm passes on the stock exhaust and i never really even put the hammer down on the car.

Just from taking it easy though around town - I think it may have lost a little on the bottom end and maybe gained a tad at the top...pretty much no difference except for look and sound.

[Sky Hi]

Originally Posted by Stealthy4 You would think. The pipe diameter looks to be the same however i didnt measure it, i just eyeballed it. I didnt measure the muffler sizes either however they look pretty close too and the hangers on the muffler line right up with where the stock hangers lined up (the rubber bushing didnt change positions)... Anyway, there must be something different about it because it sounds like it flows much better (it just sounds smoother at idle...the stocker you could almost see each cylinder fire as the exhaust puffed)

I did this mod on my Sky. The Redline Turbo muffler is larger and has more volume. I believe it flows more. It is louder. It makes sense because the system was designed for the extra backpressure and silencing of the turbo.

[oldone]

will the sky redline exhaust system bolt up to the solstice base?

[BANDITCAR]

I just put a GXP exhaust on my 2.4 and I love the way it sounds and feels (rumbly). I've told everyone that I can hear my exhaust in Stereo instead of Mono now. haha

Install was easy, did it with the front wheels on ramps and the passenger side jacked up on the rear puck.

[RedDevil]

I've owned a 2.4 before buying my recent turbo 2.0 and I had the Magna Flow dual exhaust installed on my base model with the RK Sport dual rear carbon fiber fascia. It sounded great. With my new 2.0 and stock turbo exhaust, the sound is anything but impressive. It was very quiet on the 2.0ltr. I'm surprised it is loud at all on the 2.4 considering that only the right side of the dual exhaust 2.0 actually works. The left side is totally dead. In the winter no steam even comes out on that side. So the dual is really not a TRUE dual exhaust. It's just for show and only performs as a single exhaust. I can't wait to buy an aftermarket TRUE dual exhaust for my 2.0 and sell this stock one. I'll be sure to let everyone know when I'm ready to sell it.

The Magna flow has a larger diameter pipe, so I would expect it to be louder than the stock dual 2.0 GXP exhaust. I think it was only .25" larger.

[Falcon Wing]

My old 2.4 w/ GXP exhaust and GM CAI:

2007 Pontiac Solstice - YouTube

2007 Pontiac Solstice - YouTube

[ChopTop]

Originally Posted by RedDevil I've owned a 2.4 before buying my recent turbo 2.0 and I had the Magna Flow dual exhaust installed on my base model with the RK Sport dual rear carbon fiber fascia. It sounded great. With my new 2.0 and stock turbo exhaust, the sound is anything but impressive. It was very quiet on the 2.0ltr. I'm surprised it is loud at all on the 2.4 considering that only the right side of the dual exhaust 2.0 actually works. The left side is totally dead. In the winter no steam even comes out on that side. So the dual is really not a TRUE dual exhaust. It's just for show and only performs as a single exhaust. I can't wait to buy an aftermarket TRUE dual exhaust for my 2.0 and sell this stock one. I'll be sure to let everyone know when I'm ready to sell it. The Magna flow has a larger diameter pipe, so I would expect it to be louder than the stock dual 2.0 GXP exhaust. I think it was only .25" larger.

First I've heard 2.0 GXP dual exhaust is for show only?

[BANDITCAR]

Yeah, I made sure that I had exhaust exiting both sides after I installed it and it was. Pressure seemed about even, as well.

[rob the elder]

Originally Posted by ChopTop First I've heard 2.0 GXP dual exhaust is for show only?

On both our 2.0 cars both sides function equally well.

I put magnaflo on my car and it was a bit better. When I put the Solo HF cat it was a lot better. Frankly I like the sound of the wife's RL with the Solo quiet exhaust better than mine with the high flow cat and magnaflo.

[RedDevil]

Originally Posted by rob the elder On both our 2.0 cars both sides function equally well.

Not really. The 2.4ltr is a slightly larger engine so it does show steam exiting both sides during cold winter weather. I good indicator on how well it truly functions. Just a little bit more on the right side. This is normal. Just look at the muffler part. You will see that it has 2 exits, one for each side, but only one entrance on the right side, which is why the steam in the winter months comes out more on that side. It takes longer for it to travel through the exhaust pipes to exit the left side because it has more distance to cover. A TRUE dual exhaust has 2 entrances on the muffler, one for each side. Like the ones sold at SOLO. That's why I say it's really more for show, not much performance over the single exhaust.

[ChopTop]

Got it, makes sense. I was understanding/reading it as if GM had the passenger exhaust exit tube tacked or welded on one end of the muffler with no exhaust muffler opening.

[Shadofax]

Originally Posted by RedDevil Not really. The 2.4ltr is a slightly larger engine so it does show steam exiting both sides during cold winter weather. I good indicator on how well it truly functions. Just a little bit more on the right side. This is normal. Just look at the muffler part. You will see that it has 2 exits, one for each side, but only one entrance on the right side, which is why the steam in the winter months comes out more on that side. It takes longer for it to travel through the exhaust pipes to exit the left side because it has more distance to cover. A TRUE dual exhaust has 2 entrances on the muffler, one for each side. Like the ones sold at SOLO. That's why I say it's really more for show, not much performance over the single exhaust.

A true dual exhaust would have dual pipes, one coming off each exhaust manifold up front, and traveling with both pipes all the way to the rear (or sides pipes on the old vette).

Doesn't really matter in this case, I think there are plenty of opinions on here that the stock GXP exhaust actually flows darn well, and is well matched to a stock or mildly modified car unless it is sound you are after. The single pipe is nicely sized, darn straight thanks to the tunnel design, until you get to the muffler. It has 2 exhaust routes out when you really start to get into it. Idling/low speed you might notice steam from just one side on a cold morning, I've noticed this with ours.

[RedDevil]

Originally Posted by Shadofax A true dual exhaust would have dual pipes, one coming off each exhaust manifold up front, and traveling with both pipes all the way to the rear (or sides pipes on the old vette). Doesn't really matter in this case, I think there are plenty of opinions on here that the stock GXP exhaust actually flows darn well, and is well matched to a stock or mildly modified car unless it is sound you are after. The single pipe is nicely sized, darn straight thanks to the tunnel design, until you get to the muffler. It has 2 exhaust routes out when you really start to get into it. Idling/low speed you might notice steam from just one side on a cold morning, I've noticed this with ours.

You basically just said the same thing I said in a different way. The sound however still sucks on the 2.0ltr. Needs more growl. Probably why it sounds louder on the 2.4ltr.