Brian Eldred Posted April 27, 2020 Report Share Posted April 27, 2020 Hi all, This is the exhaust that's been on my 4A since I've owned it, and probably much longer. Can anyone identify it? The single pipe is 2" bore (larger than standard?), there's a small box in front of the back box, which has twin 2 1/2" tail pipes. My problem is that although it looks cool and sounds nice, it's just too loud for comfortable cruising. I'm wondering if I can just replace the back box without going to the expense of a complete new system. Any ideas? PS it also grounds frequently, which is why it's hanging wonky.... Thanks, Brian Quote Link to post Share on other sites
Mark1965TR4aBRG Posted April 27, 2020 Report Share Posted April 27, 2020 You may get lucky with a Phoenix rear box. The exit pipe is upswept and mine hangs off pretty close to where yours is. Will have a look for a pic incase that might help. Quote Link to post Share on other sites
Malbaby Posted April 27, 2020 Report Share Posted April 27, 2020 Looks to me that the rear muffler is too close to the rear valance. I would fit a new larger flat muffler in place of the existing two so that only the exit pipe is close to the valance for better road clearance. Quote Link to post Share on other sites
Brian Eldred Posted April 28, 2020 Author Report Share Posted April 28, 2020 I've found one for a classic mini that looks similar. I've requested the dimensions. Quote Link to post Share on other sites
Mark1965TR4aBRG Posted April 28, 2020 Report Share Posted April 28, 2020 Quote Link to post Share on other sites
stuart Posted April 28, 2020 Report Share Posted April 28, 2020 6 minutes ago, Mark1965TR4aBRG said: I have the same with a slightly different mounting, though as I have a solid axle 4a I have plenty of ground clearance. Stuart. Quote Link to post Share on other sites
Brian Eldred Posted April 28, 2020 Author Report Share Posted April 28, 2020 Thanks Mark. What bore is the inlet pipe? Quote Link to post Share on other sites
Mark1965TR4aBRG Posted April 30, 2020 Report Share Posted April 30, 2020 On 4/28/2020 at 2:07 PM, Brian Eldred said: Thanks Mark. What bore is the inlet pipe? Good question Brian, but I don't know and the car's not here for me to measure. It's the Big Bore sports system & sounds great! I have ground it a few times when on tour, loaded up with co driver and not sparing the ponies... If you tuck it up out the way neatly you have to try to ground it. I don't think mine's as upswept as Stuart's but I'll look for a side shot. I'd highly recommend the whole Phoenix system. Quote Link to post Share on other sites
Mark1965TR4aBRG Posted April 30, 2020 Report Share Posted April 30, 2020 Quote Link to post Share on other sites
Mark1965TR4aBRG Posted April 30, 2020 Report Share Posted April 30, 2020 ..maybe it's Stuart's bumperless rear end that makes it look different.. Quote Link to post Share on other sites
stuart Posted April 30, 2020 Report Share Posted April 30, 2020 1 hour ago, Mark1965TR4aBRG said: ..maybe it's Stuart's bumperless rear end that makes it look different.. Possibly, I have now got the bumpers back on but no pictures Im afraid. Another side view here. Stuart. Quote Link to post Share on other sites
Mark1965TR4aBRG Posted May 1, 2020 Report Share Posted May 1, 2020 I would like to try the 'bumperless look' on my car one day - looks good. Quote Link to post Share on other sites
Brian Eldred Posted May 4, 2020 Author Report Share Posted May 4, 2020 The Phoenix systems seem very popular (but pricey). What's the noise level like at cruising speed (say 60 -70) with the big bore sports system? I've not managed to find anything of the same dimensions as my current back box, so I might have to bite the bullet and replace the complete system. I know it's probably been covered before, but are there many advantages of a big bore system over standard bore on a standard engine ? And what size is standard bore anyway? Thanks, Brian Quote Link to post Share on other sites
Harbottle Posted May 4, 2020 Report Share Posted May 4, 2020 7 minutes ago, Brian Eldred said: The Phoenix systems seem very popular (but pricey). What's the noise level like at cruising speed (say 60 -70) with the big bore sports system? I've not managed to find anything of the same dimensions as my current back box, so I might have to bite the bullet and replace the complete system. I know it's probably been covered before, but are there many advantages of a big bore system over standard bore on a standard engine ? And what size is standard bore anyway? Thanks, Brian Loud, would be an apt description. I have it on my Tr5 and it sounds great at speed. People know when you have overtaken them. I have a fast road cam and at idle it sounds spitty, but 2500rpm and above wow. Paul Quote Link to post Share on other sites
Mark1965TR4aBRG Posted May 5, 2020 Report Share Posted May 5, 2020 17 hours ago, Brian Eldred said: The Phoenix systems seem very popular (but pricey). What's the noise level like at cruising speed (say 60 -70) with the big bore sports system? I've not managed to find anything of the same dimensions as my current back box, so I might have to bite the bullet and replace the complete system. I know it's probably been covered before, but are there many advantages of a big bore system over standard bore on a standard engine ? And what size is standard bore anyway? Thanks, Brian Depending on how buried my right foot is it's either the twin Webers or the Phoenix I hear the most, but typically is a combination of them both. The full system sounds great! Quote Link to post Share on other sites
ChrisR-4A Posted May 5, 2020 Report Share Posted May 5, 2020 Hi Brian, if your thinking of Continental motorway touring say 2-4 hour stints then I would not go for a Phoenix system. I tried one and found it much too loud for longer journeys as was my original Moss single pipe single silencer sports system. What I ended up with and have been using for over 10 years now is, standard twin front downpipe, then stainless single pipe to SS standard rear TR 250 crossbox which has twin tailpipes. It is more free flow than standard single tailpipe crossbox and although it has a crisp note if you floor it, it is very quiet cruising at 60-75. Chris Quote Link to post Share on other sites
Brian Eldred Posted May 5, 2020 Author Report Share Posted May 5, 2020 40 minutes ago, ChrisR-4A said: Hi Brian, if your thinking of Continental motorway touring say 2-4 hour stints then I would not go for a Phoenix system. I tried one and found it much too loud for longer journeys as was my original Moss single pipe single silencer sports system. What I ended up with and have been using for over 10 years now is, standard twin front downpipe, then stainless single pipe to SS standard rear TR 250 crossbox which has twin tailpipes. It is more free flow than standard single tailpipe crossbox and although it has a crisp note if you floor it, it is very quiet cruising at 60-75. Chris Thanks Chris, that sounds like a good solution. We did a 1700 mile trip to France last year and that's when I decided I needed less noise! Not been anywhere this year of course :-(( Quote Link to post Share on other sites
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