Seems to sound fine, Since the exhaust is more visible now, I did notice the exhaust hangs down a bit more on the passenger side? Is my engine sagging somehow? transmission mounts? they are original...
I'll get a pic up later today...
GDP twin tip exhaust installed, one issue
- Richard Holler
- 356 Fan
- Posts: 101
- Joined: Sat Aug 04, 2018 2:04 pm
- Tag: 1963 356 S T6 coupe
- Location: Chicago, Illinois
GDP twin tip exhaust installed, one issue
1963 356 S T6 Karmann Coupe (stock engine)
Front disc brake conversion
GDP Dual Exhaust
Momo Classic steering wheel
SMD headlights
CUlayer LED rear tails
Superleicht spec (aka missing V brace and copious amounts of Bondo)
Front disc brake conversion
GDP Dual Exhaust
Momo Classic steering wheel
SMD headlights
CUlayer LED rear tails
Superleicht spec (aka missing V brace and copious amounts of Bondo)
- C J Murray
- 356 Fan
- Posts: 9236
- Joined: Fri Oct 23, 2009 7:24 pm
- Location: 30MI WEST OF PHILA
- Contact:
Re: GDP twin tip exhaust installed, one issue
That could be many things so measuring everything is the only way to find out. You can also use a level on the sump, the muffler, and the body.
'57 Speedster
'59 Sunroof
'60 Devin D Porsche Race Car
'63 Cabriolet "Norm"
'67 911 S Original Owner
'03 Ferrari 575M
'09 Smart Passion
'59 Sunroof
'60 Devin D Porsche Race Car
'63 Cabriolet "Norm"
'67 911 S Original Owner
'03 Ferrari 575M
'09 Smart Passion
-
- 356 Fan
- Posts: 4184
- Joined: Sun Apr 20, 2008 12:54 am
Re: GDP twin tip exhaust installed, one issue
Richard,
If the trans mounts are original, Most likely their oil-soaked & squashed from age. Also, the twin-pipes should be in line w/its neighbor,
but hopefully the body's underside hasn't been repaired from any previous damage.
Dick
If the trans mounts are original, Most likely their oil-soaked & squashed from age. Also, the twin-pipes should be in line w/its neighbor,
but hopefully the body's underside hasn't been repaired from any previous damage.
Dick
-
- 356 Fan
- Posts: 30
- Joined: Fri Dec 16, 2016 10:32 pm
Re: GDP twin tip exhaust installed, one issue
I installed the GDP sport muffler on my '65 SC a few weeks ago. I helped a pro friend with a lift and although the lift makes a nice difference in ease of install it's not necessary. You could do it in your home garage without much trouble. I replaced the original stock muffler. I handled the issue of the exhaust body cutouts by installing front bumper guards on the rear to cover the holes. They do the job and also look cleaner IMHO. The GDP is beautifully built and fits great. The sound is a bit disappointing as I was hoping for a little more noise. Yes it's a bit louder and deeper, but not enough to justify installing it for that reason. To me it sounds pretty much like the stock muffler. It's about 6 Lbs. lighter than the stock muffler which represents about a 25% decrease in weight hanging out over the back of the car. Performance is fine. It seems pretty similar to the stock muffler. It would be nice to see a dyno comparison. Am I happy with it? Yes. I don't plan to go back.
-
- 356 Fan
- Posts: 197
- Joined: Sat Mar 29, 2008 1:11 pm
- Location: Texas
Re: GDP twin tip exhaust installed, one issue
Richard
Nice but it looks like it hangs down a little on the passengers side.
Jim
Nice but it looks like it hangs down a little on the passengers side.
Jim
- John Clarke
- 356 Fan
- Posts: 2115
- Joined: Wed Aug 27, 2008 6:38 am
- Location: East Sussex, England
- Contact:
Re: GDP twin tip exhaust installed, one issue
Hi all
SO, both Richard Holler and Richard Sutcliffe seem to have there GDP exhaust lower on the passenger side! Strange!
Is the GDP a stainless steel system? If it is, it probably accounts for the slightly increased noise levels.
And Richard Sutcliffe, where did you obtain your front bumper overiders / guards for the rear (upside down)? It's a brilliant way to get rid of the holes left by the stock tailpipes. been meaning to do that for a few years now since installing a Bursch system, but have never come across a pair of front guards!
Cheers Jay
SO, both Richard Holler and Richard Sutcliffe seem to have there GDP exhaust lower on the passenger side! Strange!
Is the GDP a stainless steel system? If it is, it probably accounts for the slightly increased noise levels.
And Richard Sutcliffe, where did you obtain your front bumper overiders / guards for the rear (upside down)? It's a brilliant way to get rid of the holes left by the stock tailpipes. been meaning to do that for a few years now since installing a Bursch system, but have never come across a pair of front guards!
Cheers Jay
-
- 356 Fan
- Posts: 30
- Joined: Fri Dec 16, 2016 10:32 pm
Re: GDP twin tip exhaust installed, one issue
James. I'm not sure where you see that the GDP exhaust hangs down on the passenger side. To me it looks perfectly even and level. Regarding installing the front bumper guards without the exhaust holes on the rear to cover the exhaust cut-outs in the chassis...that was my plan. I looked at used fronts, most were trashy and not cheap so I finally bit the bullet and spent $280 on a new set of Dansk's on EBay. They arrived in perfect condition and went on without a problem. Regarding the lack of over-riders, I deliberately took them off when I installed them. I wanted to try out a cleaner look. I'm not sure I'll run with this look long term but for now I'm staying with it. Re: the small holes...plug them with 1/8" (I think...measure) black plastic plugs from ACE Hardware. Finally. Yes the GPD system is totally stainless and a work of art.
Last edited by Richard Sutliffe on Tue Oct 02, 2018 4:54 pm, edited 1 time in total.
- John Brooks
- 356 Fan
- Posts: 2174
- Joined: Tue Jul 08, 2008 11:50 am
- Location: Whidbey Island WA.
- Contact:
Re: GDP twin tip exhaust installed, one issue
I just helped install one. Had a similar list. Go feel the top 2&4 header pipes, where they pass under the pinch welds at the rear of the body. On Toms we had a 1-2mm interference on the passengers side #2 pipe.
Easy fix with a little hammer work, to make a radius in the seam for clearance. Split the seam open to access each side. Fold the front inner liner forward and the back one aft and radius out it centered on the pipes. Toms now looks like it was designed that way.
i thought it was from a previous collision repair. But after relieving the interference the tips were even.
Edit.. Went over to Toms an took a photo, also found no clearence on the full flow oil filter heat shield that I missed before. It's tight, if you have a PM full flow pump mounted filter, you will need to make a dent along the 2:00 front in the new muffler it to get some More clearence. Fits 3mm without the heat shield.
Easy fix with a little hammer work, to make a radius in the seam for clearance. Split the seam open to access each side. Fold the front inner liner forward and the back one aft and radius out it centered on the pipes. Toms now looks like it was designed that way.
i thought it was from a previous collision repair. But after relieving the interference the tips were even.
Edit.. Went over to Toms an took a photo, also found no clearence on the full flow oil filter heat shield that I missed before. It's tight, if you have a PM full flow pump mounted filter, you will need to make a dent along the 2:00 front in the new muffler it to get some More clearence. Fits 3mm without the heat shield.
- Attachments
John Brooks
62 Roadster
66 912
84 Cab
getting pushed around in porsches since 1965
62 Roadster
66 912
84 Cab
getting pushed around in porsches since 1965