DIY Exhaust Mod – Gain of 10+ HP!!!

[namooz]

Hey, new to this forum. Nice place. 2002 Boxter S, 85k m. Did the Crios mod a little differently. Easily repairable if you don't like it, but it did the job. Took the 15mm hole as a guide, but rather made a long, thin rectangle that followed the tube around about 25mm by around 2mm wide (same basic opening area). A slit rather than a hole, right where the bend is starting. I was thinking less bottleneck...., maybe. It's coming out the path of least resistance a little better from the first hit. Like in the gentlemans video, you can hear the engine breathing better and free'er and free'er-gas off. I drive the car for sure, but i'm not a rever, I'm a let her warm up a bit guy.. It's beefier in idle and the above now, just a little bit, fatter. I hear the roadster sound a little, would like more, but, eh. The car runs on rails, man. I love the experience. The whole thing came about because i couldn't hear the motor at stoplights and bottomed out a few into 1st. Shi=*t. Thanks for all the posts here. I knew I had to do this and it helped after driving around new to me for around 3 weeks to get here. You can bend the inner pipe up with a standard but strong screw driver if you like for more. I did just a little. No droaning sound. Motor does run a little more fluidly, bein' a seat of the pants guy and sniffer/listener. P.S. IMS, rotors good......etc. Great forum.

[thefunkygibbon]

Sorry for the thread necromancy.
Particlewave - have you got a guide as to what you did? I've tried to look at the things you wrote a few posts back but i'm unclear whether that was the final thing you did or whether the welding work you did patched up that description of the holes you made?

Does what you did involve removing muffler and taking it apart or is it something you can do as the car sits/on ramps?

[particlewave]

Originally Posted by thefunkygibbon

Sorry for the thread necromancy.
Particlewave - have you got a guide as to what you did? I've tried to look at the things you wrote a few posts back but i'm unclear whether that was the final thing you did or whether the welding work you did patched up that description of the holes you made?

Does what you did involve removing muffler and taking it apart or is it something you can do as the car sits/on ramps?

You're looking at the wrong thread. See here: Internal exhaust mod

[thefunkygibbon]

considering doing this, but its not clear from the diagram/instructions. is it just a hole in the back of the exit pipe or does the hole need to be in the pipe behind that also? the diagram seems to look like it should go through 2 pipes essentially (each side) but no mention that i can see about that being the case.

[thefunkygibbon]

ugh, just tried to take the tip off of mine and the bolt holding it on sheered off. got it off , now got to work out how to put a new bolt on when i dont have one welded to the tip any more

[ThreeSheds]

Another Crios convert...

2004 Boxster S

I have read every Crios post there is on this and other forums (fora?) and have not seen one negative comment, so I decided to risk it...

First I tried drilling, but the jumping bit was way too uncontrolled for me, however it did put a few scars in the pipe wall that helped with the next thing I tried which was poking it up the bum with a sharp stick... Well not exactly, it was a sharpened piece of bar that I found lying about. It's about 14mm across and square section and I made an asymmetric point to give it best chance of digging in...

Anyway - it was remarkably easy - I didn't even have to hit it that hard - and now I have a nice square bypass hole in each of the outlet pipes.

If you are thinking of doing this - go ahead! It's amazing.

The car used to sound (to my ears) very tame - like a normal saloon (until the induction howl sets in), but now it sounds (again, to my ears) absolutely fabulous. It sounds like a sports car should but is not too loud. It's the Goldilocks of exhaust notes. And it didn't cost me a penny... To get the same effect on my motorcycle I had to spend £260, an now that's a bit too loud

Crios - thank you, thank you, thank you...

[M9G]

Hi, my exhaust tip is one single big oval, can the mod be done to this one aswell?

Cheers

[tommy583]

Yes if you look inside the tip you will see it has 2 sides.

[M9G]

Originally Posted by tommy583

Yes if you look inside the tip you will see it has 2 sides.

Ok yeah, so am I drilling on the two closes sides of the two pipes or the two sides furthest apart? or doesn't it matter?

Cheers

[particlewave]

Originally Posted by M9G

Ok yeah, so am I drilling on the two closes sides of the two pipes or the two sides furthest apart? or doesn't it matter?

Cheers

Go back and read pages 8, 9, 10 and 11 of this thread. All of your questions are answered in the pictures.

Here: DIY Exhaust Mod – Gain of 10+ HP!!!

[particlewave]

The internal bypass sounds much better :
Internal exhaust mod

[particlewave]

On an upward angle and a sharp punch works better than a drill.

[M9G]

All done and de-snorkeled :-)

Mine are more to the side but I assume its all going into the same chamber

Cheers :-)

[particlewave]

Originally Posted by M9G

I assume its all going into the same chamber

Yep


.....

[M9G]

Originally Posted by particlewave

Yep


.....

sweeeeeet :-) thanks for your help, much appreciated

[bigfy39]

+1 satisfied DIYer. Did this on my 03 base and it sounds a little louder than stock! Drilled 3/8th size holes. I'll go larger if I want more sound later on.

[DPhantom679]

After reading many of the posts I used a few tips from several people and did my mod in probably 5 mins. I have a a 2000S with welded tips and was having problems getting the right angle and getting the drill bit to bite. I used a long screwdriver and used it as a punch and made an X shape and then I had a large lag bolt I ground down on my grinder ( didnt have a long 1/2 bit handy) and then used it to finish the holes.

Spent more time reading through all the posts than it took me to do it. If you are handy and have welded tips then there are several ways to make this work. This was what I used to knock it out tonight.

[Farmlifer]

So does anyone has a recommended 1/2 or 3/8 drill bit that won’t break?

My 2001S has welded tips and I don’t have a grinder to fabricate a punch. Want to do this modification but hear of broken bits and frustration for some...

[Stroked & Blown]

Originally Posted by Farmlifer

So does anyone has a recommended 1/2 or 3/8 drill bit that won’t break?

My 2001S has welded tips and I don’t have a grinder to fabricate a punch. Want to do this modification but hear of broken bits and frustration for some...

See DPhantom's post just above yours. A long flathead screwdriver serves as a good punch to locate the bit.

[tommy583]

+986 +986