Top Straight 6 BHP/L

Highest Straight Six Engined BHP / Litre Cars

Top 20

The Highest Power / Litre Straight Six Engined Cars Ever

The Highest Power / Litre Straight Six Engined Cars Ever

By David ChappleUpdated 27 May 2025

These cars have the highest specific output (BHP per Litre) of any Straight Six engined production cars ever.

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2023 BMW 3.0 CSL (G82)
Specific Output: 184 BHP/L
1^st

(2023)
...3.0 CSL

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3 L Inline 6 Bi-Turbo

187 mph

3.6 seconds

552 BHP

25.7 mpg

2 Doors

2 Seats

440 L

1,624 kg
Front - RWD
All Specs
With a specific output of 184 BHP/L, the BMW 3.0 CSL takes first place.
It's a 2 door RWD Coupé with 2 seats and was sold during 2023.
It is also 1st in The Highest Power / Litre BMW Cars Ever.
2022 BMW M4 CSL (G82)
Specific Output: 181 BHP/L
2^nd

(2022 - 2024)
...M4 CSL

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3 L Inline 6 Bi-Turbo

191 mph

3.7 seconds

542 BHP

28.8 mpg

2 Doors

2 Seats

440 L

1,625 kg
Front - RWD
All Specs
With a specific output of 181 BHP/L, the BMW M4 CSL takes joint second place.
It's a 2 door RWD Coupé with 2 seats and was sold from 2022 to 2024.
It is also 1st in The Fastest BMW Cars Ever.
2024 BMW M4 CS (G82)
Specific Output: 181 BHP/L
3^rd

(2024 - present)
...M4 CS

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3 L Inline 6 Bi-Turbo

188 mph

3.4 seconds

542 BHP

27.7 mpg

2 Doors

4 Seats

440 L

1,760 kg
Front - 4WD
All Specs
With a specific output of 181 BHP/L, the BMW M4 CS takes joint second place.
It's a 2 door 4WD Coupé with 4 seats, with deliveries starting in 2024.
It is also joint 2nd in The Highest Power / Litre BMW Cars Ever.
2023 BMW M3 CS (G80)
Specific Output: 181 BHP/L
4^th

(2023 - 2024)
...M3 CS

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3 L Inline 6 Bi-Turbo

188 mph

3.4 seconds

542 BHP

28 mpg

4 Doors

5 Seats

480 L

1,765 kg
Front - 4WD
All Specs
With a specific output of 181 BHP/L, the BMW M3 CS takes joint second place.
It's a 4 door 4WD Saloon with 5 seats and was sold from 2023 to 2024.
It is also joint 2nd in The Highest Power / Litre BMW Cars Ever.
2025 BMW M3 CS Touring (G81)
Specific Output: 181 BHP/L
5^th

(2025 - present)
...S Touring

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3 L Inline 6 Bi-Turbo

186 mph

3.5 seconds

542 BHP

26.9 mpg

5 Doors

5 Seats

500-1,510 L

1,850 kg
Front - 4WD
All Specs
With a specific output of 181 BHP/L, the BMW M3 CS Touring takes joint second place.
It's a 5 door 4WD Estate with 5 seats, with deliveries starting in 2025.
It is also joint 3rd in Cars With The Most Powerful Straight 6 Engines.
2025 BMW M2 CS (G87)
Specific Output: 175 BHP/L
6^th

(2025 - present)
...M2 CS

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3 L Inline 6 Bi-Turbo

188 mph

3.8 seconds

523 BHP

28.2 mpg

2 Doors

4 Seats

390 L

1,700 kg
Front - RWD
All Specs
With a specific output of 175 BHP/L, the BMW M2 CS takes joint sixth place.
It's a 2 door RWD Coupé with 4 seats, with deliveries starting in 2025.
It is also joint 6th in The Highest Power / Litre BMW Cars Ever.
2024 BMW M4 Competition Coupé xDrive (G82)
Specific Output: 175 BHP/L
7^th

(2024 - present)
...é xDrive

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3 L Inline 6 Bi-Turbo

155 mph

3.5 seconds

523 BHP

28.2 mpg

2 Doors

4 Seats

440 L

1,775 kg
Front - 4WD
All Specs
With a specific output of 175 BHP/L, the BMW M4 Competition Coupé xDrive takes joint sixth place.
It's a 2 door 4WD Coupé with 4 seats, with deliveries starting in 2024.
It is also joint 6th in The Highest Power / Litre BMW Cars Ever.
2024 BMW M3 Competition xDrive (G80)
Specific Output: 175 BHP/L
8^th

(2024 - present)
...on xDrive

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3 L Inline 6 Bi-Turbo

155 mph

3.5 seconds

523 BHP

28 mpg

4 Doors

5 Seats

480 L

1,780 kg
Front - 4WD
All Specs
With a specific output of 175 BHP/L, the BMW M3 Competition xDrive takes joint sixth place.
It's a 4 door 4WD Saloon with 5 seats, with deliveries starting in 2024.
It is also joint 6th in The Highest Power / Litre BMW Cars Ever.
2024 BMW M3 Competition Touring xDrive (G81)
Specific Output: 175 BHP/L
9^th

(2024 - present)
...ng xDrive

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3 L Inline 6 Bi-Turbo

155 mph

3.6 seconds

523 BHP

27.4 mpg

5 Doors

5 Seats

500-1,510 L

1,865 kg
Front - 4WD
All Specs
With a specific output of 175 BHP/L, the BMW M3 Competition Touring xDrive takes joint sixth place.
It's a 5 door 4WD Estate with 5 seats, with deliveries starting in 2024.
It is also joint 6th in The Highest Power / Litre BMW Cars Ever.
2024 BMW M4 Competition Convertible xDrive (G83)
Specific Output: 175 BHP/L
10^th

(2024 - present)
...le xDrive

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3 L Inline 6 Bi-Turbo Petrol

155 mph

3.7 seconds

523 BHP

27.7 mpg

2 Doors

4 Seats

385 L

1,925 kg
Front - 4WD
All Specs
With a specific output of 175 BHP/L, the BMW M4 Competition Convertible xDrive takes joint sixth place.
It's a 2 door 4WD Convertible with 4 seats, with deliveries starting in 2024.
It is also joint 6th in The Highest Power / Litre BMW Cars Ever.
2024 Alpina B3 GT AWD (G20)
Specific Output: 174 BHP/L
11^th

(2024 - present)
...B3 GT AWD

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3 L Inline 6 Bi-Turbo

191 mph

3.4 seconds

522 BHP

26.6 mpg

4 Doors

5 Seats

480 L

1,800 kg
Front - AWD
All Specs
With a specific output of 174 BHP/L, the Alpina B3 GT AWD takes joint eleventh place.
It's a 4 door AWD Saloon with 5 seats, with deliveries starting in 2024.
It is also joint 1st in The Highest Power / Litre Alpina Cars Ever.
2024 Alpina B3 GT Touring AWD (G21)
Specific Output: 174 BHP/L
12^th

(2024 - present)
...uring AWD

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3 L Inline 6 Bi-Turbo

190 mph

3.5 seconds

522 BHP

26.6 mpg

4 Doors

5 Seats

500-1,510 L

1,870 kg
Front - AWD
All Specs
With a specific output of 174 BHP/L, the Alpina B3 GT Touring AWD takes joint eleventh place.
It's a 4 door AWD Estate with 5 seats, with deliveries starting in 2024.
It is also joint 1st in The Highest Power / Litre Alpina Cars Ever.
2025 Alpina B4 GT Gran Coupé (G24)
Specific Output: 174 BHP/L
13^th

(2025 - present)
...an Coupé

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3 L Inline 6 Bi-Turbo

190 mph

3.5 seconds

522 BHP

26.6 mpg

4 Doors

5 Seats

470-1,290 L

1,890 kg
Front - AWD
All Specs
With a specific output of 174 BHP/L, the Alpina B4 GT Gran Coupé takes joint eleventh place.
It's a 4 door AWD Coupé with 5 seats, with deliveries starting in 2025.
It is also joint 1st in The Highest Power / Litre Alpina Cars Ever.
2021 BMW M4 Competition Coupé (G82)
Specific Output: 168 BHP/L
14^th

(2021 - 2024)
...on Coupé

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3 L Inline 6 Bi-Turbo

155 mph

3.9 seconds

503 BHP

27.7 mpg

2 Doors

4 Seats

440 L

1,725 kg
Front - RWD
All Specs
With a specific output of 168 BHP/L, the BMW M4 Competition Coupé takes joint fourteenth place.
It's a 2 door RWD Coupé with 4 seats and was sold from 2021 to 2024.
It is also joint 11th in The Highest Power / Litre BMW Cars Ever.
2024 BMW M4 Competition Coupé (G82)
Specific Output: 168 BHP/L
15^th

(2024 - present)
...on Coupé

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3 L Inline 6 Bi-Turbo

155 mph

3.9 seconds

503 BHP

29.1 mpg

2 Doors

4 Seats

440 L

1,725 kg
Front - RWD
All Specs
With a specific output of 168 BHP/L, the BMW M4 Competition Coupé takes joint fourteenth place.
It's a 2 door RWD Coupé with 4 seats, with deliveries starting in 2024.
It is also joint 11th in The Highest Power / Litre BMW Cars Ever.
2021 BMW M3 Competition (G80)
Specific Output: 168 BHP/L
16^th

(2021 - 2024)
...mpetition

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3 L Inline 6 Bi-Turbo

155 mph

3.9 seconds

503 BHP

27.7 mpg

4 Doors

5 Seats

480 L

1,730 kg
Front - RWD
All Specs
With a specific output of 168 BHP/L, the BMW M3 Competition takes joint fourteenth place.
It's a 4 door RWD Saloon with 5 seats and was sold from 2021 to 2024.
It is also joint 11th in The Highest Power / Litre BMW Cars Ever.
2024 BMW M3 Competition (G80)
Specific Output: 168 BHP/L
17^th

(2024 - present)
...mpetition

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3 L Inline 6 Bi-Turbo

155 mph

3.9 seconds

503 BHP

29.1 mpg

4 Doors

5 Seats

480 L

1,730 kg
Front - RWD
All Specs
With a specific output of 168 BHP/L, the BMW M3 Competition takes joint fourteenth place.
It's a 4 door RWD Saloon with 5 seats, with deliveries starting in 2024.
It is also joint 11th in The Highest Power / Litre BMW Cars Ever.
2021 BMW M3 Competition xDrive (G80)
Specific Output: 168 BHP/L
18^th

(2021 - 2024)
...on xDrive

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3 L Inline 6 Bi-Turbo

155 mph

3.5 seconds

503 BHP

28 mpg

4 Doors

5 Seats

480 L

1,780 kg
Front - 4WD
All Specs
With a specific output of 168 BHP/L, the BMW M3 Competition xDrive takes joint fourteenth place.
It's a 4 door 4WD Saloon with 5 seats and was sold from 2021 to 2024.
It is also joint 11th in The Highest Power / Litre BMW Cars Ever.
2021 BMW M4 Competition Coupé xDrive (G82)
Specific Output: 168 BHP/L
19^th

(2021 - 2024)
...é xDrive

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3 L Inline 6 Bi-Turbo

155 mph

3.5 seconds

503 BHP

28 mpg

2 Doors

4 Seats

440 L

1,775 kg
Front - 4WD
All Specs
With a specific output of 168 BHP/L, the BMW M4 Competition Coupé xDrive takes joint fourteenth place.
It's a 2 door 4WD Coupé with 4 seats and was sold from 2021 to 2024.
It is also joint 11th in The Highest Power / Litre BMW Cars Ever.
2022 BMW M3 Competition Touring xDrive (G81)
Specific Output: 168 BHP/L
20^th

(2022 - 2024)
...ng xDrive

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3 L Inline 6 Bi-Turbo

155 mph

3.6 seconds

503 BHP

28 mpg

5 Doors

5 Seats

500-1,510 L

1,865 kg
Front - 4WD
All Specs
With a specific output of 168 BHP/L, the BMW M3 Competition Touring xDrive takes joint fourteenth place.
It's a 5 door 4WD Estate with 5 seats and was sold from 2022 to 2024.
It is also joint 11th in The Highest Power / Litre BMW Cars Ever.

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