CMI Tailpipes
Fully-polished, precision-matched CMI tailpipe sets include pipes for both port and starboard exhausts. CMI Tailpipe sets include all of the V-band clamps, sealing gaskets, retaining bolts, jumper hoses and hose clamps required for installation. All CMI tailpipe sets are fully polished. Exhaust tips and connecting hoses are not included.
CMI Tip-Style tailpipes are standard for most exhaust applications when connecting to existing transom tips. For proper application and fit, header collector height and transom hole layout are both measured and used to determine if Tip Style tailpipes are required. A rubber connector hose is required to connect Tip-Style tailpipes to the transom tips. Use the CMI Exhaust System Build Guide to determine if CMI Tip Style tailpipes are required.
For applications that pose a risk for water reversion, CMI recommends using thru-hull tailpipes. Water reversion can occur in applications where tailpipe cooling ports are located near the engine exhaust ports. In these cases, exhaust scavenging draws cooling water from the tailpipe into the engine, which can cause premature engine failure. Thru-Hull tailpipes will minimize the potential for reversion. In extreme applications where engine positioning creates a risk of water reversion, a “completely dry tailpipe” is required. Fully-welded CMI Completely Dry tailpipes divert all water entering the system to an external dump valve which helps prevent the water from flowing into the engine.
All CMI tailpipes are designed to fit standard Mercruiser and after-market Bravo Drive or transmission applications.
- Big Elbow Top & Big Tube Race Systems
- Standard Elbow Top Systems
- Down-Turn Sport Tube Systems
- Available For All Headers
Tailpipe
Measurement Guide (PDF - 193KB)
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CMI Header and Tailpipe Accessories
How to Measure Hole Height
CMI Tailpipe Measurement Guide
All vertical dimensions are for standard height manifolds and taken on the outside of the transom with ruler flat against transom. CMI requires precise measurements ensure system fit. Plus or minus transom measurements indicate minimum and maximum dimensions in which tailpipe transom holes may be specified. Radius angles are an additional charge. See Measurement Guide for instructions to measure tailpipe installation.
Big Elbow Top & Big Tube Race Systems
Bravo Drive Applications
(dimensions listed are for 9.8" deck block & standard GM head castings)
| Thru-Hull | Transom Hole Locations (See Chart Above) | |||||
|---|---|---|---|---|---|---|
| Part | Part Number | A | B | C | D | |
| Race Straight Pipe | ||||||
| Tailpipe set (straight) polished | 39390 | 13 5/8 ±1/4" | 13 5/8 ±1/4" | Varies | Varies | |
| Race One Angle Pipe | ||||||
| Tailpipe set (straight) polished | 13 5/8 ±1/4" | 13 5/8 ±1/4" | Varies | Varies | ||
| Race Custom Two Angle Pipe | ||||||
| Tailpipe set (straight) polished | 39350 | 13 5/8 ±1/4" | 13 5/8 ±1/4" | 13 7/16 ±3" | 13 7/16 ±3" | |
| Tailpipe set (offset) polished | 39430 | 13 5/8 ±3" | 13 5/8 ±3" | 13 7/16 ±3" | 13 7/16 ±3" | |
Tailpipe
Measurement Guide (PDF - 193KB)
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Guides
CMI Header and Tailpipe Accessories
Standard Elbow Top & Sport Tube Systems
Bravo Drive Applications
(dimensions listed are for 9.8" deck block & standard GM head castings)
| Transom Tip | Transom Hole Locations (See Chart Above) | |||||
|---|---|---|---|---|---|---|
| Part | Part Number | A | B | C | D | |
| Standard MerCruiser Bravo Hole Opening | ||||||
| Tailpipe set polished | 39750 | 13 5/8 ±1/4" | 13 5/8 ±1/4" | 13 7/16 ±1/4" | 13 7/16 ±1/4" | |
| Straight Pipe | ||||||
| Tailpipe set polished | 39650 | 13 5/8 ±1/4" | 13 5/8 ±1/4" | E-Tops 14±1/4" Sports 11 9/16 ±1/4" |
E-Tops 14 11/16±1/4" Sports 12 1/2 ±1/4" |
|
| One Angle Pipe | ||||||
| Tailpipe set (straight) polished | 13 5/8 ±1/4" | 13 5/8 ±1/4" | Varies | Varies | ||
| Custom Two Angle Pipe | ||||||
| Tailpipe set (straight) polished | 39790 | 13 5/8 ±4" | 13 5/8 ±4" | 13 ±3 | 13 ±3 | |
| Tailpipe set (offset) polished | 39830 | 13 5/8 ±4" | 13 5/8 ±4" | 13 ±3 | 13 ±3 | |
| Double Miter Surcharge for C&D between 5" & 10" | 13001 | |||||
| S-Pipe | ||||||
| Tailpipe set (straight) polished | 39870 | 13 5/8 ±1/4" | 13 5/8 +10 / -2 | C and D + 2" above crank CL ±3 | ||
| Tailpipe set (offset) polished | 39690 | 13 5/8 ±10 /-2 | 13 5/8 ±10 /-2 | C and D + 2" above crank CL ±3 | ||
| Thru-Hull | ||||||
| Part/ Part Number |
Part Number | A | B | C | D | |
| Straight Pipe | ||||||
| Tailpipe set polished | 39420 | 13 5/8 ± 1/4" | 13 5/8 ± 1/4" | E-Tops 14 ±1/4" Sports 11 9/16 ±1/4" |
E-Tops 14 11/16 ±1/4" Sports 12 1/2 ±1/4" |
|
| One Angle Pipe | ||||||
| Tailpipe set polished | 13 5/8 ± 1/4" | 13 5/8 ± 1/4" | Varies | Varies | ||
| Custom Two Angle Pipe | ||||||
| Tailpipe set (straight) polished | 39380 | 13 5/8 ±1/4" | 13 5/8 ±1/4" | 13 7/16 ±3" | 13 7/16 ±3" | |
| Tailpipe set (offset) polished | 39460 | 13 5/8 ±4" | 13 5/8 ±4" | 13 7/16 ±3" | 13 7/16 ±3" | |
| Y-Pipe (Straight Stinger) | ||
|---|---|---|
| Tailpipe Set 4 1/2" Collector headers (radiused) polished, Rope Seal Style | 39120 | |
| Tailpipe Set 4" Collector headers (radiused) polished, "O" Ring style | 39130 | |
 |
||
Tailpipe Upgrade Garage
| Part | Part Number | |
| Stepped Tailpipe Addition | ||
|---|---|---|
| Stepped tailpipe option for one set | each diameter increase |
39160 |
| Note: The Stepped Tailpipe charges are an addition to prices listed in each tailpipe section. | ||
 |
||
| Radius angles replacing miters | ||
 |
||
| Transmission-Style Upcharge | ||
| Completely Dry Upcharge | ||
| Additional Charge Restrictors For Mercury Racing 525EFI/600SC/700SC |
||
| Forward Engine Tailpipe Stagger & Triple Support bracket system required for all forward engine applications |
||
| Part | Part Number | |
Forward Engine Tailpipe Support Systems |
||
| Clamp On Head Mount | 13000 | |
| Clamp On Transmission Mount | 13001 | |
| Weldo On Head Mount | ||
| Weld On Transmission Mount | ||
| 3/4" NPT Female Fitting Installed into
Tailpipe For External Cooling Water Dump |
39990 | |
| 1" NPT Female Fitting Installed into Tailpipe For External Cooling Water Dump |
19300 | |
| Sensor Couplings for Oxygen Fitting Installed In Tailpipe or Header |
41400 | |
| Oxygen Plug M18-1.5 | 19670 | |
| Sensor Couplings for Pyrometer Fitting Installed In Tailpipe or Header |
41401 | |
| Pyrometer Plug .125 NPT | 19800 | |
Tailpipe
Measurement Guide (PDF - 193KB)
Download CMI Exhaust System Build Guides
CMI Header and Tailpipe Accessories
