|
If I use them mine will have to be made. My gils already use wedges. Heads are .500 taller on exhaust. I have horrible plug access with the gils. Contemplating headers to make that much easier. Not sure how the T&L would be there since these aren’t stock heads |
Originally Posted by Sydwayz
(Post 4660306)
FACTORY CMI headers that came on 525s are the issue. CMI makes better products. But the headers that Merc spec’d for the factory package were usually just good enough to last the warranty period. CMI got the bad wrap for such, but it’s 100% Mercury’s fault. CMI wanted to put better headers on there originally but Mercury price/volume pressured them to the lesser product. |
I recommend Diamond / Bill exhaust and I will tell you why. I have worked on Volvo DPX 600 engines and had a twin app with full CMI headers - one side CMI were leaking as I CHANGED in time. That owner ended up buying at that TIME were KE currently Diamond / Bills exhaust and there was NO Drop in speed or performance period. I know because I drove and maintained the boat every year.
|
https://cimg9.ibsrv.net/gimg/www.off...b8b4370d22.jpg
https://cimg1.ibsrv.net/gimg/www.off...bc9d04377a.jpg The K/E Headers will fit the Merc 525efi - |
Bill-
Those would sure look nice painted silver and attached to my engines! |
Bill can you add a pic of the mounting flange? I would like to see that to compare to mine. Wondering if it’ll give me more plug access than my gils do. |
Changing plugs with the T&L headers is better than Gils, Gils are the worst.
|
That is Manages 27 Activator with the 525 wonder if will chime in as for speed number differences or whatever.
|
Originally Posted by endeavour32
(Post 4660367)
Changing plugs with the T&L headers is better than Gils, Gils are the worst.
|
Endeavor32: Make the beginning of the KE/Diamond tails to the end of the tips 18"-20". 19.5" is ideal. Your welcome. :)
---- Collector's Harmonics (includes Intermediate, Muffler , TailPipe) ---- 1st Harmonic = 155.2 inches long ... longest with Mufflers and TailPipes Note: Worst = 116.4 inches long for HP/TQ Loss 2nd Harmonic = 77.6 inches long ... longest recommended with Mufflers Note: Worst = 58.2 inches long for HP/TQ Loss 3rd Harmonic = 38.8 inches long ... more bottom-end Torque Note: Worst = 29.1 inches long for HP/TQ Loss 4th Harmonic = 19.4 inches long ... highly recommended , best Torque Curve 5th Harmonic = 9.7 inches long ... reduced Torque , more top-end HP sometimes 6th Harmonic = 4.9 inches long ... reduced Torque , not recommended |
| All times are GMT -5. The time now is 01:51 AM. |
Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.