How restrictive is the stock boxster muffler? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Sputter · 07-21-2009, 09:40 AM

Indeed, you bought the wrong car. However, it's your money to waste.
Don't expect any changes cept sound. You also might end up with less hps.

bigborian · 07-21-2009, 10:15 AM

all that was needed was, "it wouldn't make a difference" thanks "you bought the wrong car" was unneccessary. I bought this car for the wife and she wants it to be "zoomy" I fashioned the Technoflo Air intake for her and she likes it. I was thinking about doing the exhaust to give it a more aggressive sound without being overbearing along with letting the car breathe to free up some horsepower.

I already have a modding machine 2007 honda civic Si that i have done a lot of stuff to already so the boxster is not the "wrong car" for me. I'm not going to mod it out obviously i just wanted to do a few things to optimize the performance of the vehicle in it's stock state. I'm not putting a cat-back on it or putting nitrous on it. It's a daily driver that hardly ever sees the track but letting the car be unique in its own right. It's definately a cruise car but if i could effectively free up the exhaust to allow better flow and better sound i wouldn't mind doing that.

however if there are minimal gains from doing this then i would probably just leave it. Thanks for your input anyways

Sputter · 07-21-2009, 10:35 AM

Yes but you mentioned 1/4 mile times etc. hence the response you got.
A worded differently question would have gotten a different answer.

mptoledo · 07-21-2009, 12:24 PM

actually I was trying to figure out the same thing. There is a thread on here (see link below) that has dyno'd his car before and is going to do it after to see the HP increase. Some people think Porsche purposely restricted the boxster's air flow to cut down on HP to make the 911 look faster. I am eager to see the out come

http://www.987forum.com/forums/showthread.php?t=21061

My philosophy is a few HP here and a few Hp increase there start to add up!! *(as long as its cost effective)

Adam · 07-21-2009, 03:30 PM

The stock muffler flows pretty well the experts say. Just ask Jake Raby or Charles over at LN engineering or search some of their threads. They have done flow tests and dynoed several so called high flow performance mufflers and many lose hp compared to the stock muffler. The main slap against the oem muffler is that it is heavy.

mptoledo · 07-21-2009, 06:24 PM

Quote:

Originally Posted by Adam

The stock muffler flows pretty well the experts say. Just ask Jake Raby or Charles over at LN engineering or search some of their threads. They have done flow tests and dynoed several so called high flow performance mufflers and many lose hp compared to the stock muffler. The main slap against the oem muffler is that it is heavy.

Now that is a great answer, not just an opinion, but supported by facts. Kudos

I really would like to know if you gain any resonable HP by bypassing or removing the cats. My first car was a mgb ltd. 1st thing I did was take off the cat and put headers on it. it really put some pet in that tiney engine. I have been following some of pedros mods, but he never tells how much hp you gain or even an estimate. Since I am keeping this I want to squeeze out as much juice as possible.

http://www.pedrosgarage.com/Site/DIY%20Projects.html

mts · 07-24-2009, 05:20 AM

Quote:

Originally Posted by mptoledo

Now that is a great answer, not just an opinion, but supported by facts. Kudos

I really would like to know if you gain any resonable HP by bypassing or removing the cats. My first car was a mgb ltd. 1st thing I did was take off the cat and put headers on it. it really put some pet in that tiney engine. I have been following some of pedros mods, but he never tells how much hp you gain or even an estimate. Since I am keeping this I want to squeeze out as much juice as possible.

http://www.pedrosgarage.com/Site/DIY%20Projects.html

My car dyno'd in the 5-7 additional peak hp range before/after adding the Fabspeed cat bypass pipes. Better than nothing, but not a lot better than nothing. On the bright side they are a heck of a lot lighter and sound cool.

2K3_Boxster_S · 07-21-2009, 09:30 PM

Quote:

Originally Posted by mptoledo

actually I was trying to figure out the same thing. There is a thread on here (see link below) that has dyno'd his car before and is going to do it after to see the HP increase. Some people think Porsche purposely restricted the boxster's air flow to cut down on HP to make the 911 look faster. I am eager to see the out come

http://www.987forum.com/forums/showthread.php?t=21061

My philosophy is a few HP here and a few Hp increase there start to add up!! *(as long as its cost effective)

that's my thread, middle next month it will be dynoed for the last time and exhaust installed. I will post the numbers. I have different opinions on what to expect, which I won't get into here. We will see.

mptoledo · 07-22-2009, 07:00 AM

Quote:

Originally Posted by 2K3_Boxster_S

that's my thread, middle next month it will be dynoed for the last time and exhaust installed. I will post the numbers. I have different opinions on what to expect, which I won't get into here. We will see.

Cool, I saw you were out until august 15. I was thinking, this guy has to get his priorities straight!!

Just kiddin. Did you figure out why that guy's dyno was so low in registering your HP? As long as you use the same machine and he doesn't mess with it, it should give you an accurate reading of increased HP. Good luck and keep up the good work!!

2K3_Boxster_S · 07-22-2009, 06:53 PM

Quote:

Originally Posted by mptoledo

Cool, I saw you were out until august 15. I was thinking, this guy has to get his priorities straight!!

Just kiddin. Did you figure out why that guy's dyno was so low in registering your HP? As long as you use the same machine and he doesn't mess with it, it should give you an accurate reading of increased HP. Good luck and keep up the good work!!

Yeah, unfortunately my job interferes with my projects. but it also funds them as well.

so got to go when they say go. Well, no never figured out what was up with the dyno. don't think it was my car though, you can see the Video of the car that dynoed after me, he is used to putting down over 350 WHP. You can see and hear his car is a beast, he's hitting close to 30 psi boost. this is a quote from him:

"Yeah I thought yours seemed a little low even for a stocker.. but as they said that dyno is stingy. Dunno, mine dyno'd 90hp and 50ftlb down from last time.. "

sorry for the wait, stayed tuned for the results