Exhaust Question (Final One) - 986 Forum - The Community for Porsche Boxster & Cayman Owners

WillieB · 06-24-2005, 10:19 PM

Yellowbox, I have a Base 2.5L with and Evo High Flow Intake. The GHL you will get from Velocity Factor is the same for Base and S. I also verified with the guys at GHL by phone. It is not an exact fit as Yellowbox, on your vids (if that is you) you had to modify and create mounts to make it fit. My mechanic had a welder and machinist make all of the parts and they were perfect. She is solid.

Review: Be prepared as it is no word of a lie, at 2K - 3K RPM while in low gear, when you are cruising and needing just a bit of throttle in low gear, it resonates like crazy (low bassy sound) unless you try to keep it under 2K RPM or above 3K RPM. Even top down it is quite loud. I can however have a conversation with my wife at the same time & it did not drown out my stereo (stock factory amp). But will I get rid of it and go for stock? No!! It sounds wicked when on full throttle and revving at idle with no resonance at idle. From launch and running it thru the gears at speed no resonance as she sings a sweet symphonic sound working together with the Evo to produce music to my ears. It does sound F-1 Schumacher going through underpasses. You also do not notice at WOT how loud she is singing until you have another car beside you and the sound deflects off of it or an wall etc. I also notice she pulls through the revs stronger & cleaner than ever before. Def a HP gain. Take my word, this Exhaust is definitely, "Non-Rice!" No pun intended against ricers, it was just never my thing.

This is not an exhaust for the faint. My Boxster is a Sunday driver/garage queen for short cruises. But for those that use it as a daily driver for a long commute or cross country, it may not be for you. You may want a PSE or gamble and be the Ginea Pig and go with a Supersprint. I saw the PSE vid clip in our thread here and it is that vibrating sound I did not want while revving. It does sound great as well. GHL does not do that or have the semi-stalling feature from back pressure you saw with the Supersprint Mini Cooper. Not saying the Supersprint doesn't sound good as no one has made any claims about it on a Boxster.

Story: My wife was driving behind my Box in our other car on my way to get the install done. I pulled away hard and fast with the Evo Intake wailing as I hit 4K RPM+. I asked her later if she could hear it from behind and in the distance and she said no. Now with the GHL, I am quite sure she will be able to hear it as the intake is internal to the cockpit and the exhaust sound is rear external. It sounds different in the car while I was revving it and while she was listening in the back. Alot louder in the behind. ie) Like a Ferrari/Muscle Car taking off, but it is all Porsche!! This is my description of the sound. Overall: Sound=10/10; Resonance=3/10 (Only at 2K - 3K cruising; WOT - none) Look = 10/10 (Almost Murcielago with 2 chrome 5" straight pipes sticking out of the ass).

Tips: Get a mechanic who does alot of mufflers for tuners who can fabricate a quality mounts. I would swear his mounts were straight from GHL. GHL shld have mounts like these made and sent with the exhaust - the only downside to the product in addition to the resonance at 2 - 3K RPM.

yellowbox · 06-25-2005, 10:53 PM

I'm glad you like it. So is the sound very similar to those on yellowboxster's website? (btw, that's not my site, I'm just another yellowbox!) I guess the resonance is gone once RPM exceed 3k, even just a tad above, in any of the 5 gears, right?

WillieB · 06-26-2005, 10:05 PM

is a bit different than Yellowbox's video as I believe his video does not do it justice. His exhaust might not be as tightly fitted as he made his own mounts. My mounts were fabricated by a machinist and welder, who made them for my mechanic during install. 2-3 hrs install. It sounds more like Trent Carters as he has the Evo Intake and the GHL combined like I have (see GHL vids on this thread). Makes a difference it seems on the 2.5L.

My wife filmed another vid of me revving it and then taking off down the street. Upon reviewing the sound, it is more than I hoped for....................I would say Ferrari 355 like, but in a Porsche Boxster. In comparison, I thought my neighbors 2005 G35 Coupe sounded sweet before, but when I heard him take off on hard throttle today, it was pale in comparison to the sound of my GHL. From the inside of the car it is decieving as like I said before it is quieter inside which is a good thing. But anyone in your rear will def. feel the wrath of it. It sounds so sweet. I also passed a parked Honda and set off the alarm in first gear. And I wasn't even hard on the throttle. You can even hear it hum on approach. Yes, I have gotten the hang of keeping the gears either below 2K RPM or above 2800 RPM as this is the huge resonance range. Also the resonance bugged me less 2nd and 3rd time drives. I guess it was just intial shock. But after the video shot from the outside, I am sold as this is the sound I wanted. Powerful, throaty, low growl, Ferrari like with the echos. Again, if you hang around 2K - 2800 RPM then you will hear the resonance. If you hammer it on WOT from 1st through to 5th (or 6th) it is beautiful.

Before the exhaust with the Evo High Flow intake, the deeper sound was at 4K RPM +. Now at range she will growl. So on take off 1K - 4K it is mostly GHL exhaust, then at 4 K and up, combo Evo Intake and GHL. Beautiful. The car also pulls clean earlier and also later in the RPM range. I know this is a subjective topic, but if you are like me and always enjoyed hearing a Ferrari or a Lambo let it rip and love the echo of the exhaust from 1st, shift to 2nd, and 3rd etc. 3 blocks away, then this is the one for you.

Adam · 06-27-2005, 09:51 AM

Glad you like the exhaust. It sounds like the one to get if you want an aggressive sound from the back. FYI: Be sure not to lug the engine in an attempt to keep the the resonance low. Porsche says keep it above 1.5K rpm.

WillieB · 06-27-2005, 01:52 PM

Quote:

Originally Posted by Adam

Glad you like the exhaust. It sounds like the one to get if you want an aggressive sound from the back. FYI: Be sure not to lug the engine in an attempt to keep the the resonance low. Porsche says keep it above 1.5K rpm.

Will do on the keeping it above 1500 RPM. I didn't know this. Then maybe I will use more gas and keep it above 2800 RPM.

Thanks again for the tip.

yellowbox · 06-27-2005, 03:48 PM

WillieB, so it's really "Ferrari 355 like"? I don't remember now a 355 sounded, but for sure a 360, which I've heard many times.

Maybe I should get the GHL exhaust, if I don't like it, I guess I can always sell it on ebay and recover some $.

For sure GHL has no torque loss, right? I want to make sure no power is loss

WillieB · 06-27-2005, 07:06 PM

Well Is shld say Mean Porsche like sound. Hmm, 360 Modena, don't know about that, this is a nice low growl. A growl no ricer I have ever heard has. Too bad my video is too big, you can hear it echo between the houses and I didn't even take it past 4K RPM in first gear. Word of advice, as long as you can deal with or drive between the resonance btwn 2K - 2800 RPM, you will be fine. Do your self a favor if you do get one, make sure you have someone take a video(s) of you taking off with the GHL on. Trust me, you will be surprised.

WB