The item you selected has ended, but we found something similar.View original listing

YearMakeModelTrimEngine

Picture 1 of 2

Stock photo

Iridium Spark Plug NGK 6637 - Picture 1 of 2

Iridium Spark Plug NGK 6637 - Picture 2 of 2

Spark Plug-Iridium IX NGK 6637

4.899 product ratings

A

autopartsusa124 (13580)

97.6% positive feedback

Price:

$12.39

Free shipping

Estimated delivery Thu, Oct 2 - Mon, Oct 6

Returns:

30 days returns. Seller pays for return shipping.

Condition:

New

Part Number: 6637. People that look up auto parts for a living get paid to do it because it is not as easy as people might think. Auto Parts USA has over 40 years of auto parts experience.

About this product

Product Identifiers

BrandNGK

Manufacturer Part Number6637

eBay Product ID (ePID)76256428

Product Key Features

California Prop 65 WarningNickel

Additional Product Features

NotesDescription--Iridium IX Spark Plug

Sub TypeSpark Plug

Part TypeSecondary Ignition

All listings for this product

Iridium Spark Plug NGK 6637

item 1 Iridium Spark Plug NGK 6637

Spark Plug NGK 6637 (1 Spark Plug Only)

item 2 Spark Plug NGK 6637 (1 Spark Plug Only)

Genuine NGK 6637 BPR6EIX Iridium IX Spark Plug

item 3 Genuine NGK 6637 BPR6EIX Iridium IX Spark Plug

Spark Plug-Iridium IX NGK 6637

item 4 Spark Plug-Iridium IX NGK 6637

Spark Plug-Iridium IX NGK 6637

item 5 Spark Plug-Iridium IX NGK 6637

NGK SPARK PLUGS 6637 BPR6EIX Spark Plugs For Iridium IX version of BPR6ES

item 6 NGK SPARK PLUGS 6637 BPR6EIX Spark Plugs For Iridium IX version of BPR6ES

NGK Spark Plug 6637

item 7 NGK Spark Plug 6637

NGK SPARK PLUGS 6637 BPR6EIX Spark Plugs For Iridium IX version of BPR6ES

item 8 NGK SPARK PLUGS 6637 BPR6EIX Spark Plugs For Iridium IX version of BPR6ES

NGK 7223 Spark Plug #7223/04

item 9 NGK 7223 Spark Plug #7223/04

NGK 7223 Spark Plug #7223/04

item 10 NGK 7223 Spark Plug #7223/04

NGK SPARK PLUGS 6637 BPR6EIX Spark Plugs For Iridium IX version of BPR6ES

item 11 NGK SPARK PLUGS 6637 BPR6EIX Spark Plugs For Iridium IX version of BPR6ES

Iridium Spark Plug NGK 6637

item 12 Iridium Spark Plug NGK 6637

Iridium Spark Plug NGK 6637 BPR6EIX for BMW R100, Yamaha XS1100

item 13 Iridium Spark Plug NGK 6637 BPR6EIX for BMW R100, Yamaha XS1100

NGK Iridium IX Spark Plug BPR6EIX (6637)

item 14 NGK Iridium IX Spark Plug BPR6EIX (6637)

NGK Iridium-IX Spark Plug BPR6EIX #6637

item 15 NGK Iridium-IX Spark Plug BPR6EIX #6637

NGK 6637 Iridium IX Spark Plug BPR6EIX, 1 Pack

item 16 NGK 6637 Iridium IX Spark Plug BPR6EIX, 1 Pack

Spark Plug-Iridium IX NGK 6637

item 17 Spark Plug-Iridium IX NGK 6637

+$6.30 shipping

Spark Plug-Iridium IX NGK 6637

item 18 Spark Plug-Iridium IX NGK 6637

+$6.30 shipping

Spark Plug-Iridium IX NGK 6637

item 19 Spark Plug-Iridium IX NGK 6637

+$6.30 shipping

1 Pack NGK 6637 Iridium IX Spark Plug BPR6EIX

item 20 1 Pack NGK 6637 Iridium IX Spark Plug BPR6EIX

Spark Plug-Iridium IX NGK 6637

item 21 Spark Plug-Iridium IX NGK 6637

Iridium Spark Plug NGK 6637

item 22 Iridium Spark Plug NGK 6637

Spark Plug-Iridium IX NGK 6637

item 23 Spark Plug-Iridium IX NGK 6637

NGK BPR6EIX Iridium Spark Plug - 6637

item 24 NGK BPR6EIX Iridium Spark Plug - 6637

+$7.99 shipping

Iridium Spark Plug NGK 6637

item 25 Iridium Spark Plug NGK 6637

One New NGK Iridium Resistor Spark Plug 6637 BPR6EIX for Nissan & more

item 26 One New NGK Iridium Resistor Spark Plug 6637 BPR6EIX for Nissan & more

Iridium Spark Plug NGK 6637

item 27 Iridium Spark Plug NGK 6637

NGK SPARK PLUGS - 6637 - Iridium IX Spark Plug ? BPR6EIX for Arctic Cat Prowler

item 28 NGK SPARK PLUGS - 6637 - Iridium IX Spark Plug ? BPR6EIX for Arctic Cat Prowler

Spark Plug-Iridium IX NGK 6637

item 29 Spark Plug-Iridium IX NGK 6637

Spark Plug-Iridium IX NGK 6637

item 30 Spark Plug-Iridium IX NGK 6637

item 31 Genuine NGK NGK Iridium IX Spark Plug 6637

+$9.99 shipping

NGK Iridium-IX Spark Plug BPR6EIX #6637 for BMW

item 32 NGK Iridium-IX Spark Plug BPR6EIX #6637 for BMW

Spark Plug-Iridium IX NGK 6637

item 33 Spark Plug-Iridium IX NGK 6637

Spark Plug #6637/04

item 34 Spark Plug #6637/04

+$10.00 shipping

Set of 2 Genuine NGK 6637 BPR6EIX Iridium IX Spark Plugs

item 35 Set of 2 Genuine NGK 6637 BPR6EIX Iridium IX Spark Plugs

2 pc NGK 6637 BPR6EIX Iridium IX Spark Plugs for XS63DP XS63 XP64DP2 XP64 ox

item 36 2 pc NGK 6637 BPR6EIX Iridium IX Spark Plugs for XS63DP XS63 XP64DP2 XP64 ox

Iridium Spark Plug NGK 6637

item 37 Iridium Spark Plug NGK 6637

Spark Plug-Iridium IX NGK 6637

item 38 Spark Plug-Iridium IX NGK 6637

NGK SPARK PLUGS 6637 Iridium IX Spark Plug - BPR6EIX

item 39 NGK SPARK PLUGS 6637 Iridium IX Spark Plug - BPR6EIX

+$10.49 shipping

4x BPR6EIX Iridium Spark Plugs 6637 Upgrade Spark/Power Pre-Gapped

item 40 4x BPR6EIX Iridium Spark Plugs 6637 Upgrade Spark/Power Pre-Gapped

4 Packs Spark Plugs For ngk Iridium IX 6637 BPR6EIX 6637 BPR6EIX Tune Up

item 41 4 Packs Spark Plugs For ngk Iridium IX 6637 BPR6EIX 6637 BPR6EIX Tune Up

Spark Plug-Iridium IX NGK 6637

item 42 Spark Plug-Iridium IX NGK 6637

For ngk Iridium IX SPark Plugs - BPR6EIX (6637) SET OF 4Pcs -

item 43 For ngk Iridium IX SPark Plugs - BPR6EIX (6637) SET OF 4Pcs -

NGK BPR6EIX 6637 Iridium Spark Plugs (2-Pack) for BMW R100, XS1100

item 44 NGK BPR6EIX 6637 Iridium Spark Plugs (2-Pack) for BMW R100, XS1100

Ngk Spark Plugs 6637 Ngk Iridium Ix Spark Plug

item 45 Ngk Spark Plugs 6637 Ngk Iridium Ix Spark Plug

item 46 Genuine NGK NGK Iridium IX Spark Plug 6637

+$16.99 shipping

Set 4Pcs BPR6EIX SPARK PLUGS 6637 ForAudi 200 Quattro 1989 / 1990 /1991 10V

item 47 Set 4Pcs BPR6EIX SPARK PLUGS 6637 ForAudi 200 Quattro 1989 / 1990 /1991 10V

Set 4Pcs For ngk - 6637 - Iridium IX Spark Plugs, BPR6EIX

item 48 Set 4Pcs For ngk - 6637 - Iridium IX Spark Plugs, BPR6EIX

Set 4Pcs - BPR6EIX NEW BRANDS SPARK PLUGS 6637 - For Audi 200 1989 1990 1991

item 49 Set 4Pcs - BPR6EIX NEW BRANDS SPARK PLUGS 6637 - For Audi 200 1989 1990 1991

2 Pack NGK 6637 Iridium IX Spark Plugs BPR6EIX

item 50 2 Pack NGK 6637 Iridium IX Spark Plugs BPR6EIX

4x New #6637 BPR6EIX Iridium Spark Plugs Upgrade Spark/Power Pre-Gapped

item 51 4x New #6637 BPR6EIX Iridium Spark Plugs Upgrade Spark/Power Pre-Gapped

4 Packs Spark Plugs For ngk Iridium IX 6637 BPR6EIX 6637 Tune Up

item 52 4 Packs Spark Plugs For ngk Iridium IX 6637 BPR6EIX 6637 Tune Up

Iridium Spark Plug NGK 6637

item 53 Iridium Spark Plug NGK 6637

+$12.95 shipping

4 Pack Spark Plugs NGK Iridium IX 6637 BPR6EIX 6637 BPR6EIX Tune Up

item 54 4 Pack Spark Plugs NGK Iridium IX 6637 BPR6EIX 6637 BPR6EIX Tune Up

4 Pack Spark Plugs NGK Iridium IX 6637 BPR6EIX 6637 BPR6EIX Tune Up

item 55 4 Pack Spark Plugs NGK Iridium IX 6637 BPR6EIX 6637 BPR6EIX Tune Up

NGK Iridium IX Spark Plug BPR6EIX (6637)

item 56 NGK Iridium IX Spark Plug BPR6EIX (6637)

Spark Plug-Iridium IX NGK 6637

item 57 Spark Plug-Iridium IX NGK 6637

+$21.52 shipping

6x New Iridium IX Spark Plugs For XS63DP XS63 XP64DP2 XP64 TM #6637 BPR6EIX

item 58 6x New Iridium IX Spark Plugs For XS63DP XS63 XP64DP2 XP64 TM #6637 BPR6EIX

8x New Spark Plugs #BPR6EIX 6637 Upgrade Spark/Power Pre-Gapped Iridium

item 59 8x New Spark Plugs #BPR6EIX 6637 Upgrade Spark/Power Pre-Gapped Iridium

listings for this product

Ratings and Reviews

4.9

9 product ratings

8 users rated this 5 out of 5 stars
1 users rated this 4 out of 5 stars
0 users rated this 3 out of 5 stars
0 users rated this 2 out of 5 stars
0 users rated this 1 out of 5 stars

Would recommend

Good value

Good quality

Most relevant reviews

by doug12496
Jun 30, 2017
NGK BPR6EIX Iridium Spark Plug
Premium product offering excellent performance. Fuel economy went from mid 30's to over 41 mpg on my 1978 XS1100. Your mileage may vary depending upon your riding style...
Verified purchase: YesCondition: New
by lamafia_1976
Nov 29, 2021
Good spark plugs
Those items make the engine as soft, quiet and smooth.
Verified purchase: YesCondition: New
by edgrrr75
Mar 09, 2021
Worth it. Should last a long time.u
Great plug for my Enfield Classic 500.
Verified purchase: YesCondition: New
by dee_wreck
Sep 17, 2025
quality
quality
Verified purchase: YesCondition: New
by goodusedtoys1
Sep 07, 2024
Excellent plug, fixed my problem!!...
Excellent plug, fixed my problem!!
Verified purchase: YesCondition: New

Best Selling in Spark Plugs

Save on Spark Plugs

You may also like