How restrictive is the stock boxster muffler?

[mts]

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.

[mptoledo]

Originally Posted by mts

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.

Actually I found a good use for the rear heated trunk, It keeps my pizza nice and hot by the time I get home. I actually fitted a family size cooler in the "FRUNK" so i can have hot pizza in the back and cold beer out of the front.

On the serious side, I noticed modding a Porsche is as bad as when I had my Vette. I found real quickly that you don;t go in and ask for a corvette altenator, you ask for a GM Altenator. I mean come on you can supercharge a frickin miata for around $2000, but to do a porsche your lookng at a starting price of around $7000.

Now I didn't buy my Box to street race, but when one of those cocky little kids roll up next to me, reving his engine, in his Mustang gt with spinners and walmart radio cranking out nothing but distortion, I would seriously like to at least show him the superiority of finely tuned German machine.

[mts]

Originally Posted by mptoledo

On the serious side, I noticed modding a Porsche is as bad as when I had my Vette. I found real quickly that you don;t go in and ask for a corvette altenator, you ask for a GM Altenator. I mean come on you can supercharge a frickin miata for around $2000, but to do a porsche your lookng at a starting price of around $7000.

Now I didn't buy my Box to street race, but when one of those cocky little kids roll up next to me, reving his engine, in his Mustang gt with spinners and walmart radio cranking out nothing but distortion, I would seriously like to at least show him the superiority of finely tuned German machine.

If you want to outrun a Mustang, get to your closest road course where you have to turn a bunch. You should do pretty well stock vs stock. A Boxster is the the BIG time wrong car for the stop light grand prix.

On the Miata comment, its not really a fair comparison. Ignoring the fact that there are/were significantly more Miatas sold than Boxsters which means there is more market competition, the older model Miata motors were based off a forced induction motor and were relatively low compression with simple engine management. Pretty easy to slap a basic kit on them and not blow anything up. All Boxsters are much more complicated cars than older Miatas are, especially when it comes to the stock engine management, and all Boxster motors are higher compression that don't take too well to forced induction unless you are very careful. However, that being said, price a base Cosworth supercharger (one of the few units available) for a late model Miata which has significantly more advanced technology than the older Miatas.....you are looking $5k+ starting price.

[edevlin]

Mufflers can be tricky on our cars, I have tried four different mufflers, stock, two dansk, and one gembella. I think I ran dynos on two of them. Two of them gave a lot of resonance (gemballa, and one of the dansk) , and at least one cost 3+ hp on the dynojet dyno (gemballa), it felt like it was not as fast on the butt dyno as well.

Jake Raby is comming up with more hard data on exhaust systems for our cars one of these days which should be very useful. That being said, if you can get an muffler, or muffler mod that does not have that resonance, and does not compromise performance, the sound is sure makes it seem like it has more hp and is more fun. Hey, remember, this is all about having fun....

Ed

:dance: