COLLECTOR EXTENSIONS - Straight, Tapered, Slip-on Styles, Slip-on Turnouts
Please read the Cheap Performance Gains page for more discussion of the performance benefits of experimenting with collector lengths AND sizes by using our Straight and Tapered Bolt-on Collector Extensions.
Straight and Tapered Collector Extensions feature three bolt flanges that are TIG welded to the end of the tubing with the gasket surface GROUND flat and then internally deburred. (We do NOT make extensions or street hookup cones with the ends of the tubing rolled into a flanged flat lip that is held against the gasket by the collector flange as we have seen the flanged area break off in use - resulting in the extension or the connected street exhaust system falling off the car and on to the track or the street!)
 Pairs of Collector Extensions from left to right: Tapered Collector Extensions - 2 1/2" OD x 12" long tapered up to match 3" flange on inlet; 2 3/4" OD x approximate 9" long tapered up to match 3" flange on inlet (cut length matches length of "blued" areas in extensions to right); 2 3/4" OD x 12" long tapered up to 3" (used at drag strip); 3" OD x 12" long (no taper). Collector flanges are Part Number 60P39 and match all other 3" 3 bolt flanges used elsewhere. (Again, collector flanges are TIG welded to the tubing ends, GROUND flat, with welds internally deburred.) |
Tester/Tuner/Experimenter Discounts: |
Buy any two pairs of 2 1/2", 3", or 3 1/2" Straight or Tapered Collector Extensions (part numbers start with 90 or 92) and get a 20% discount off the cheaper of the two pairs PLUS 4 matching flange gaskets FREE (worth $13-$15). Buy three or more pairs of 2 1/2", 3", or 3 1/2" Straight or Tapered Collector Extensions (part numbers start with 90 or 92) and get a 25% discount off the cheapest extension pair, 20% off all other extension pairs except for the most expensive pair which is sold at the listed Price Each multiplied by 2. Also includes 4 matching flange gaskets per pair of extensions FREE (double the amount of gaskets given FREE in the previous offer - worth $39-$45 or more!). |
Split the cost of experimenting with different collector extensions with a friend (or two?) - particularly if your headers and your friend's headers share the same outlet diameter - and get some of the most inexpensive performance gains you might ever buy! |
(3 bolt flanges are standard in design and match all current header manufacturer bolt patterns.
You may double check bolt hole distances by looking at our Collector and Tube Flange page.)
Inlet Diameter to Tube Diameter - Extension Length | 3 Bolt Flange Part Number | Part Number | Price Each |
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MILD STEEL Straight Collector Extensions |
2 1/2" to 2 1/2" - 12" Long | 60 L 37 | 90 L 12 | $33.70 |
2 1/2" to 2 1/2" - 18" Long | 60 L 37 | 90 L 18 | $39.30 |
2 1/2" to 2 1/2" - 24" Long | 60 L 37 | 90 L 24 | $44.95 |
3" to 3" - 12" Long | 60 P 39 | 90 P 12 | $39.45 |
3" to 3" - 18" Long | 60 P 39 | 90 P 18 | $45.95 |
3" to 3" - 24" Long | 60 P 39 | 90 P 24 | $52.50 |
3 1/2" to 3 1/2" - 12" Long | 60 R 30 | 90 R 12 | $46.20 |
3 1/2" to 3 1/2" - 18" Long | 60 R 30 | 90 R 18 | $54.95 |
3 1/2" to 3 1/2" - 24" Long | 60 R 30 | 90 R 24 | $63.70 |
4" to 4" - 12" Long | 60 T 31 | 90 T 12 | $63.90 |
4" to 4" - 18" Long | 60 T 31 | 90 T 18 | $72.80 |
4" to 4" - 24" Long | 60 T 31 | 90 T 24 | $81.75 |
MILD STEEL Tapered Collector Extensions |
3" to 2 1/2" - 12" Long | 60 P 39 | 92 LP 12 | $45.15 |
3" to 2 1/2" - 18" Long | 60 P 39 | 92 LP 18 | $50.75 |
3" to 2 1/2" - 24" Long | 60 P 39 | 92 LP 24 | $56.40 |
3" to 2 3/4" - 12" Long | 60 P 39 | 92 NP 12 | $45.45 |
3" to 2 3/4" - 18" Long | 60 P 39 | 92 NP 18 | $51.20 |
3" to 2 3/4" - 24" Long | 60 P 39 | 92 NP 24 | $57.00 |
3 1/2" to 3" - 12" Long | 60 R 30 | 92 PR 12 | $49.25 |
3 1/2" to 3" - 18" Long | 60 R 30 | 92 PR 18 | $55.75 |
3 1/2" to 3" - 24" Long | 60 R 30 | 92 PR 24 | $62.30 |
3 1/2" to 3 1/4" - 12" Long | 60 R 30 | 92 QR 12 | $55.55 |
3 1/2" to 3 1/4" - 18" Long | 60 R 30 | 92 QR 18 | $65.20 |
3 1/2" to 3 1/4" - 24" Long | 60 R 30 | 92 QR 24 | $74.90 |
4" to 3 1/2" - 12" Long | 60 T 31 | 92 RT 12 | $71.05 |
4" to 3 1/2" - 18" Long | 60 T 31 | 92 RT 18 | $79.80 |
4" to 3 1/2" - 24" Long | 60 T 31 | 92 RT 24 | $88.55 |
4" to 3 3/4" - 12" Long | 60 T 31 | 92 ST 12 | $75.15 |
4" to 3 3/4" - 18" Long | 60 T 31 | 92 ST 18 | $85.95 |
4" to 3 3/4" - 24" Long | 60 T 31 | 92 ST 24 | $96.75 |
MILD STEEL - Slip-On Extensions |
3 1/4" ID, 3 1/4" OD - 18" Long | Includes 4 pairs of Weld Tabs | 94 Q 18 | $88.70/pr |
3 3/4" ID, 3 3/4" OD - 18" Long | Includes 4 pairs of Weld Tabs | 94 S 18 | $104.95/pr |
4" ID, 4" OD - 18" Long | Includes 4 pairs of Weld Tabs | 94 T 18 | $103.20/pr |
MILD STEEL - Slip-On Turnouts |
3" ID, 3" OD - 12" Long | Includes 4 pairs of Weld Tabs | 95 P 12 | $91.30/pr |
3 1/2" ID, 3 1/2" - 12" Long | Includes 4 pairs of Weld Tabs | 95 R 12 | $106.90/pr |
4" ID, 4" OD - 14" Long | Includes 4 pairs of Weld Tabs | 95 T 14 | $121.80/pr |
Additional Information |